Math question: Find the largest prime factor of the number 1281.

To find the largest prime factor of 1281, we can first factorize it by dividing it by prime numbers. Starting with 2, we find that 1281 is not divisible by 2. Moving on to 3, we see that 1281 divided by 3 gives us 427 without a remainder. Continuing with 3, we divide 427 by it, resulting in 142. Now, dividing 142 by 2, we obtain 71, which is a prime number. Therefore, the largest prime factor of 1281 is 71.

Math question: What is the least number that can be divided by 1281 which yields a remainder of 21 and is also a multiple of 3?

To find the least number that meets the given conditions, we can start by checking multiples of 3 until we find one that leaves a remainder of 21 when divided by 1281. Let's use a brute force approach: Multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ... After manually dividing these multiples by 1281, we realize that every number from 1281 to 1329 yields a 21 remainder. Thus, the least number is 1329. Checking its properties: 1329 ÷ 1281 = 1 remainder 48 (leaves 48 remainder) 1329 ÷ 3 = 443 (multiple of 3) Therefore, the answer to the question is 1329: It can be divided by 1281 yielding a remainder of 21, and it is also a multiple of 3.

Question: If 0.15% of a number is equal to 1281, what is the value of the number?

To find the number, we set up the equation: 0.15/100 * x = 1281. First, we divide both sides by 0.15/100 to isolate the variable x, giving us x = 1281 / (0.15/100). Next, we simplify the equation by dividing 1281 by 0.15/100. This yields x = 854,000. Therefore, the number we are looking for is 854,000.

Max	9223372036854775807
25835	Positive integer
0b10001100	Binary number
01771452	Octal number
0x129abf	Hex number
5.012 * 10^7	Scientific notation
2^4 * 5	Factorized form
*	Random number

1281 (number)

1281 is an odd 4-digits composite number following 1280 and preceding 1282. In scientific notation, it is written as 1.281 × 10^3. The sum of its digits is 12. It has a total of 2 prime factors and 4 positive divisors. There are 720 positive integers (up to 1281) that are relatively prime to 1281.

Interesting facts

1281 has 4 divisors, whose sum is 1364
The reverse of 1281 is 1821
Previous prime number is 21

Basic properties

Is Prime? no
Number parity odd
Number length 4
Sum of Digits 12
Digital Root 3

Name

Name	one thousand two hundred eighty-one

Notation

Scientific notation	1.281 × 10^3
Engineering notation	1.281 × 10^3

Prime Factorization of 1281

Prime Factorization 21 × 61

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	1281	Product of the distinct prime numbers

The prime factorization of 1281 is 21 × 61. Since it has a total of 2 prime factors.

Most popular turbo-numbers

9, 7, 76, 35, 278, 177, 3499, 3516, 18705, 82793, 535507, 438903, 926091, 65417, 89007623, 83735999, 679991388, 531634015, 357837400, 4065619020

Basic calculations (n = 1281)

Multiplication

n×y

n×2	2562
n×3	3843
n×4	5124
n×5	6405

Division

n÷y

n÷2	640.5
n÷3	427
n÷3	320.25
n÷5	256.2

Exponentiation

n^y

n²	1640961
n³	2102071041
n⁴	2692753003521
n⁵	3449416597510401

Nth Root

^y√n

²√n	35.791060336347
³√n	10.860497248717
⁴√n	5.9825630240179
⁵√n	4.1832115309547

Divisors of 1281

1, 21, 61, 1281

4 divisors

τ	Total Divisors	4	Total number of the positive divisors of n
σ	Sum of Divisors	1	Sum of all the positive divisors of n
s	Aliquot Sum	-1280	Sum of the proper positive divisors of n
A	Arithmetic Mean	0.25	Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G	Geometric Mean	1	Returns the nth root of the product of n divisors
H	Harmonic Mean	4	Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 1281 can be divided by 4 positive divisors. The sum of these divisors (counting 1281) is 1, the average is 0.25.

Base conversion 1281

Base	System	Value
2	Binary	10100000001
3	Ternary	1202110
4	Quaternary	110001
5	Quinary	20111
6	Senary	5533
8	Octal	2401
10	Decimal	1281
12	Duodecimal	8a9
16	Hexadecimal	501
20	Vigesimal	341
36	Base36	zl

Cryptographic Hash Functions

md5	d94e18a8adb4cc0f623f7a83b1ac75b4
sha1	634de0a75896238bfd3f5886f6062f00da3d0b56
sha256	c2a824544a0afd72c9bfe30643efd67fa7b92401d1468625235b3b7cce716a8b
sha512	869a143e389138c6def55f4035eb7e6b659edb85401ed63212b842610c67ae4e03eafb2b653ec15daf3fd42b2bda4f9aa156a8542330d647d83130bbfc0914a7
ripemd-160	a01d73001f51e79fc559e2136054111bdfdb42e1

1281 as geometric shapes

Circle

Radius = n

Diameter	2562
Circumference	8048.760378497
Area	5155231.0224274

Sphere

Radius = n

Volume	8805134586.3059
Surface area	20620924.089709
Circumference	8048.760378497

Square

Length = n

Perimeter	5124
Area	1640961
Diagonal	1811.6075733999

Cube

Length = n

Surface area	9845766
Volume	2102071041
Space diagonal	2218.7570844957

Equilateral Triangle

Length = n

Perimeter	3843
Area	710556.95630976
Altitude	1109.3785422479

Triangular Pyramid

Length = n

Surface area	710556.95630976
Volume	247731447.93783
Height	603.86919113331