Math question: What is the sum of the square roots of the factors of the number 1981? Solution: To find the factors of 1981, we find the numbers that evenly divide 1981. The factors of 1981 are 1, 37, 53, and 1981 itself. Taking the square root of each factor, we get √1 = 1, √37 ≈ 6.08, √53 ≈ 7.28, and √1981 ≈ 44.47. Adding up these square roots, we get 1 + 6.08 + 7.28 + 44.47 ≈ 58.83.

The sum of the square roots of the factors of 1981 is approximately 58.83.

Math question: If a number is multiplied by 3, then divided by 9, and the result is squared, what is the value when this process is applied to the number 1981?

To find the value when this process is applied to 1981, we can follow the given steps. First, multiply 1981 by 3 to get 5943. Next, divide 5943 by 9 which gives us 660.33 recurring. Finally, we square 660.33 recurring which equals approximately 435563.11. Therefore, when the process is applied to 1981, the result is approximately 435563.11.

Math question: What is the sum of all odd numbers between 1981 and 1989?

To find the sum of all odd numbers between 1981 and 1989, we can utilize the formula for the sum of an arithmetic series. The first term, a, is 1981, the common difference, d, is 2 (as odd numbers have a difference of 2), and the number of terms, n, is (1989-1981)/2 + 1 = 5. To find the sum, S, we use the formula S = (n/2)(2a + (n-1)d). Plugging the given values, we have S = (5/2)(2(1981) + (5-1)(2)) = (5/2)(3962 + 8) = (5/2)(3970) = 1985. Therefore, the sum of all odd numbers between 1981 and 1989 is 1985.

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

1981 (number)

1981 is an odd 4-digits composite number following 1980 and preceding 1982. In scientific notation, it is written as 1.981 × 10^3. The sum of its digits is 19. It has a total of 2 prime factors and 4 positive divisors. There are 1692 positive integers (up to 1981) that are relatively prime to 1981.

Interesting facts

1981 has 4 divisors, whose sum is 2272
The reverse of 1981 is 1891
Previous prime number is 7

Basic properties

Is Prime? no
Number parity odd
Number length 4
Sum of Digits 19
Digital Root 1

Name

Name	one thousand nine hundred eighty-one

Notation

Scientific notation	1.981 × 10^3
Engineering notation	1.981 × 10^3

Prime Factorization of 1981

Prime Factorization 7 × 283

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	1981	Product of the distinct prime numbers

The prime factorization of 1981 is 7 × 283. Since it has a total of 2 prime factors.

Most popular turbo-numbers

1, 10, 15, 92, 369, 347, 7638, 4448, 88998, 20492, 505448, 134812, 4097708, 6087690, 72504890, 73619527, 766605369, 19112897, 1710748401, 1540012034

Basic calculations (n = 1981)

Multiplication

n×y

n×2	3962
n×3	5943
n×4	7924
n×5	9905

Division

n÷y

n÷2	990.5
n÷3	660.33333333333
n÷3	495.25
n÷5	396.2

Exponentiation

n^y

n²	3924361
n³	7774159141
n⁴	15400609258321
n⁵	30508606940733901

Nth Root

^y√n

²√n	44.508426168536
³√n	12.559185985894
⁴√n	6.6714635702023
⁵√n	4.5643285164019

Divisors of 1981

1, 7, 283, 1981

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	-1980	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 1981 can be divided by 4 positive divisors. The sum of these divisors (counting 1981) is 1, the average is 0.25.

Base conversion 1981

Base	System	Value
2	Binary	11110111101
3	Ternary	2201101
4	Quaternary	132331
5	Quinary	30411
6	Senary	13101
8	Octal	3675
10	Decimal	1981
12	Duodecimal	1191
16	Hexadecimal	7bd
20	Vigesimal	4j1
36	Base36	1j1

Cryptographic Hash Functions

md5	b3b4d2dbedc99fe843fd3dedb02f086f
sha1	ea1b37da89c9714afa6e8264911e12813c480b40
sha256	a78f19952edd18bf02b3c9eb704b088e2120941d6acb22f6f795c42796e60252
sha512	0f6672cee6e2797e8862ffa1886faa9e8d8cd92eaabe10d4b74473dfee44002a88add1aa7aa2e885e59ff1a846c80c1c9eb6d7ffd7069f6c0e8bd9bfb893583d
ripemd-160	031c77ba4ad4e097eaad53641cbf734bc294b103

1981 as geometric shapes

Circle

Radius = n

Diameter	3962
Circumference	12446.990093523
Area	12328743.687634

Sphere

Radius = n

Volume	32564321660.271
Surface area	49314974.750537
Circumference	12446.990093523

Square

Length = n

Perimeter	7924
Area	3924361
Diagonal	2801.5570670611

Cube

Length = n

Surface area	23546166
Volume	7774159141
Space diagonal	3431.1926497939

Equilateral Triangle

Length = n

Perimeter	5943
Area	1699298.1598105
Altitude	1715.596324897

Triangular Pyramid

Length = n

Surface area	1699298.1598105
Volume	916193441.10408
Height	933.85235568703