Math question: What is the sum of the factors of 391 and the largest prime factor of its square root?

To find the factors of 391, we can divide it by every number up to its square root, i.e. 19. Adding these factors, which are 1, 17, and 391, gives a sum of 409. The square root of 391 is approximately 19.79, and the largest prime factor of 19.79 is 19 itself. Hence, the answer is 409 + 19 = 428.

Math Question: If the number 391 is divided by a certain two-digit number, the quotient is 7 and the remainder is 6. What is this two-digit number?

To find the two-digit number, we can set up the equation 391 = 7x + 6, where x represents the unknown two-digit number. Simplifying, we have 391 - 6 = 7x, giving us 385 = 7x. Dividing both sides by 7, we get x = 55. Therefore, the two-digit number is 55.

Math Question: If 391 is divided by 13 and multiplied by 8, what is the result?

To find the result, we first divide 391 by 13, which equals 30. Then, we multiply it by 8, giving us 30 * 8 = 240. Therefore, the result of dividing 391 by 13 and multiplying it by 8 is 240.

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

391 (number)

391 is an odd 3-digits composite number following 390 and preceding 392. In scientific notation, it is written as 3.91 × 10^2. The sum of its digits is 13. It has a total of 2 prime factors and 4 positive divisors. There are 352 positive integers (up to 391) that are relatively prime to 391.

Interesting facts

391 has 4 divisors, whose sum is 432
The reverse of 391 is 193
Previous prime number is 23

Basic properties

Is Prime? no
Number parity odd
Number length 3
Sum of Digits 13
Digital Root 4

Name

Name	three hundred ninety-one

Notation

Scientific notation	3.91 × 10^2
Engineering notation	3.91 × 10^0

Prime Factorization of 391

Prime Factorization 23 × 17

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	391	Product of the distinct prime numbers

The prime factorization of 391 is 23 × 17. Since it has a total of 2 prime factors.

Most popular turbo-numbers

10, 8, 63, 30, 952, 801, 5573, 120, 36554, 60766, 484721, 61270, 3383784, 7536005, 35512774, 4056222, 38021626, 825225710, 7599629754, 6139691263

Basic calculations (n = 391)

Multiplication

n×y

n×2	782
n×3	1173
n×4	1564
n×5	1955

Division

n÷y

n÷2	195.5
n÷3	130.33333333333
n÷3	97.75
n÷5	78.2

Exponentiation

n^y

n²	152881
n³	59776471
n⁴	23372600161
n⁵	9138686662951

Nth Root

^y√n

²√n	19.773719933285
³√n	7.3123828115732
⁴√n	4.4467651088499
⁵√n	3.2994028976577

Divisors of 391

1, 17, 23, 391

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	-390	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 391 can be divided by 4 positive divisors. The sum of these divisors (counting 391) is 1, the average is 0.25.

Base conversion 391

Base	System	Value
2	Binary	110000111
3	Ternary	112111
4	Quaternary	12013
5	Quinary	3031
6	Senary	1451
8	Octal	607
10	Decimal	391
12	Duodecimal	287
16	Hexadecimal	187
20	Vigesimal	jb
36	Base36	av

Cryptographic Hash Functions

md5	5a4b25aaed25c2ee1b74de72dc03c14e
sha1	4c629c4c340105f45966111510782ae516f7bf65
sha256	a934c244755c66aebb0d6f9f5687038ffae8f00b00b28b4e17521016393f38b9
sha512	28b09907ac38690f87138d11a66bc7b4e13ddefec647986fe118fdb567909f4376d05fb68391bcca7cf15da740545da7a68a8feacac8a7a39c55e2ec85b264ec
ripemd-160	d4cdbd04ece9dcc106b9ec639864c4d10f1e384c

391 as geometric shapes

Circle

Radius = n

Diameter	782
Circumference	2456.7254551072
Area	480289.82647346

Sphere

Radius = n

Volume	250391096.2015
Surface area	1921159.3058938
Circumference	2456.7254551072

Square

Length = n

Perimeter	1564
Area	152881
Diagonal	552.95750288788

Cube

Length = n

Surface area	917286
Volume	59776471
Space diagonal	677.23186575943

Equilateral Triangle

Length = n

Perimeter	1173
Area	66199.414877984
Altitude	338.61593287972

Triangular Pyramid

Length = n

Surface area	66199.414877984
Volume	7044724.6665835
Height	184.31916762929