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

81509991 (number)

81509991 is an odd 8-digits composite number following 81509990 and preceding 81509992. In scientific notation, it is written as 8.1509991 × 10^7. The sum of its digits is 42. It has a total of 3 prime factors and 8 positive divisors. There are 54123000 positive integers (up to 81509991) that are relatively prime to 81509991.

Interesting facts

81509991 has 8 divisors, whose sum is 109113984
The reverse of 81509991 is 19990518
Previous prime number is 251

Basic properties

Is Prime? no
Number parity odd
Number length 8
Sum of Digits 42
Digital Root 6

Name

Name	eighty-one million five hundred nine thousand nine hundred ninety-one

Notation

Scientific notation	8.1509991 × 10^7
Engineering notation	8.1509991 × 10^6

Prime Factorization of 81509991

Prime Factorization 3 × 251 × 108247

Composite number

ω	Distinct Factors	3	Total number of distinct prime factors
Ω	Total Factors	3	Total number of prime factors
rad	Radical	81509991	Product of the distinct prime numbers

The prime factorization of 81509991 is 3 × 251 × 108247. Since it has a total of 3 prime factors.

Most popular turbo-numbers

3, 1, 77, 76, 80, 152, 5440, 7386, 54410, 43204, 201811, 737103, 1778038, 6018371, 54413795, 97619447, 954383680, 12046220, 8129263796, 2930025707

Basic calculations (n = 81509991)

Multiplication

n×y

n×2	163019982
n×3	244529973
n×4	326039964
n×5	407549955

Division

n÷y

n÷2	40754995.5
n÷3	27169997
n÷3	20377497.75
n÷5	16301998.2

Exponentiation

n^y

n²	6643878632820081
n³	5.4154248756626E+23
n⁴	4.4141123287643E+31
n⁵	3.5979425619057E+39

Nth Root

^y√n

²√n	9028.288375988
³√n	433.5810389823
⁴√n	95.0173056658
⁵√n	38.215730801455

Divisors of 81509991

1, 3, 251, 753, 108247, 324741, 27169997, 81509991

8 divisors

τ	Total Divisors	8	Total number of the positive divisors of n
σ	Sum of Divisors	1	Sum of all the positive divisors of n
s	Aliquot Sum	-81509990	Sum of the proper positive divisors of n
A	Arithmetic Mean	0.125	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	8	Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81509991 can be divided by 8 positive divisors. The sum of these divisors (counting 81509991) is 1, the average is 0.125.

Base conversion 81509991

Base	System	Value
2	Binary	100110110111011111001100111
3	Ternary	12200101010200120
4	Quaternary	10312323321213
5	Quinary	131331304431
6	Senary	12031013023
8	Octal	466737147
10	Decimal	81509991
12	Duodecimal	2336a173
16	Hexadecimal	4dbbe67
20	Vigesimal	1598ejb
36	Base36	1cj1if

Cryptographic Hash Functions

md5	6f15de9e6d1f8e5cb16798469d7a6bcd
sha1	a41efe4b16774791548d769bc768e5b68b3d22f4
sha256	7bec1f10c5a5df4bb3e96fb1e49879e333912944b620b6438b90a54d0e581e92
sha512	d7eedd074853386ab3a955a6e105f73a9ecce47208c2c91ab3a1693783b050c297cd8ef6639476489524f90980f2def1c1cc787769061172f8dd8aa150323ea6
ripemd-160	c641a969696f353de0ea520093914d7b08f8ea0b

81509991 as geometric shapes

Circle

Radius = n

Diameter	163019982
Circumference	512142377.83954
Area	2.087236030421E+16

Sphere

Radius = n

Volume	2.2684078673932E+24
Surface area	8.3489441216839E+16
Circumference	512142377.83954

Square

Length = n

Perimeter	326039964
Area	6643878632820081
Diagonal	115272534.74111

Cube

Length = n

Surface area	39863271796920486
Volume	5.4154248756626E+23
Space diagonal	141179445.73648

Equilateral Triangle

Length = n

Perimeter	244529973
Area	2.8768838378414E+15
Altitude	70589722.868241

Triangular Pyramid

Length = n

Surface area	2.8768838378414E+15
Volume	6.3821394209789E+22
Height	38424178.247036