81657981 (number)

81657981 is an odd 8-digits composite number following 81657980 and preceding 81657982. In scientific notation, it is written as 8.1657981 × 10^7. The sum of its digits is 45. It has a total of 5 prime factors and 24 positive divisors. There are 51596160 positive integers (up to 81657981) that are relatively prime to 81657981.

Interesting facts

Basic properties

Name

Name eighty-one million six hundred fifty-seven thousand nine hundred eighty-one

Notation

Scientific notation 8.1657981 × 10^7
Engineering notation 8.1657981 × 10^6

Prime Factorization of 81657981

Prime Factorization 3 × 3 × 23 × 113 × 3491

Composite number
ω Distinct Factors 4
Total number of distinct prime factors
Ω Total Factors 5
Total number of prime factors
rad Radical 27219327
Product of the distinct prime numbers

The prime factorization of 81657981 is 3 × 3 × 23 × 113 × 3491. Since it has a total of 5 prime factors.

Most popular turbo-numbers

5, 3, 11, 61, 725, 790, 7875, 7180, 27305, 95876, 399578, 124344, 3969554, 7023180, 29125836, 8197723, 831113221, 791285223, 5001345900, 1774173691

Basic calculations (n = 81657981)

Multiplication

n×y
n×2 163315962
n×3 244973943
n×4 326631924
n×5 408289905

Division

n÷y
n÷2 40828990.5
n÷3 27219327
n÷3 20414495.25
n÷5 16331596.2

Exponentiation

ny
n2 6668025860996361
n3 5.4449752906475E+23
n4 4.4462568882916E+31
n5 3.6307236050524E+39

Nth Root

y√n
2√n 9036.4805649102
3√n 433.84328439589
4√n 95.060404821935
5√n 38.229597673735

Divisors of 81657981

1, 3, 9, 23, 69, 113, 207, 339, 1017, 2599, 3491, 7797, 10473, 23391, 31419, 80293, 240879, 394483, 722637, 1183449, 3550347, 9073109, 27219327, 81657981

24 divisors

τ Total Divisors 24
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81657980
Sum of the proper positive divisors of n
A Arithmetic Mean 0.041666666666667
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 24
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81657981 can be divided by 24 positive divisors. The sum of these divisors (counting 81657981) is 1, the average is 0.041666666666667.

Base conversion 81657981

Base System Value
2 Binary 100110111100000000001111101
3 Ternary 12200122122200200
4 Quaternary 10313200001331
5 Quinary 131401023411
6 Senary 12034114113
8 Octal 467400175
10 Decimal 81657981
12 Duodecimal 2341b939
16 Hexadecimal 4de007d
20 Vigesimal 15a74j1
36 Base36 1cm7p9

Cryptographic Hash Functions

md5 223f8858864987f2b137d096e1091325
sha1 119d8e9b494f168ee12bc6ae983243c7d97613ef
sha256 e4be939179c41d9b92adbd37cae0baecde9e146fab05aeb4f1f97e47fa447ea3
sha512 a1a2ed44131826c8f65d15774718ac7a65bfdd265d80053b9008c21ae0c0dbfb8d6cd57f29cd8c797f41b030b03bb8c3fed88b831e1bc67efccbb8298f487341
ripemd-160 8d06ffe20b7b17699c7500de936fccbb3487bce8

81657981 as geometric shapes

Circle

Radius = n
Diameter 163315962
Circumference 513072226.43315
Area 2.0948221058853E+16

Sphere

Radius = n
Volume 2.2807859162768E+24
Surface area 8.3792884235412E+16
Circumference 513072226.43315

Square

Length = n
Perimeter 326631924
Area 6668025860996361
Diagonal 115481824.2062

Cube

Length = n
Surface area 40008155165978166
Volume 5.4449752906475E+23
Space diagonal 141435771.93549

Equilateral Triangle

Length = n
Perimeter 244973943
Area 2.8873398943572E+15
Altitude 70717885.967747

Triangular Pyramid

Length = n
Surface area 2.8873398943572E+15
Volume 6.4169649190167E+22
Height 38493941.402068