81661531 (number)

81661531 is an odd 8-digits composite number following 81661530 and preceding 81661532. In scientific notation, it is written as 8.1661531 × 10^7. The sum of its digits is 31. It has a total of 3 prime factors and 8 positive divisors. There are 69876648 positive integers (up to 81661531) that are relatively prime to 81661531.

Interesting facts

Basic properties

Name

Name eighty-one million six hundred sixty-one thousand five hundred thirty-one

Notation

Scientific notation 8.1661531 × 10^7
Engineering notation 8.1661531 × 10^6

Prime Factorization of 81661531

Prime Factorization 7 × 19219 × 607

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 3
Total number of prime factors
rad Radical 81661531
Product of the distinct prime numbers

The prime factorization of 81661531 is 7 × 19219 × 607. Since it has a total of 3 prime factors.

Most popular turbo-numbers

6, 3, 3, 13, 986, 377, 1636, 5999, 78622, 47531, 909769, 687450, 1359970, 7411212, 95251429, 68038265, 778076411, 304639267, 2617251646, 5791035389

Basic calculations (n = 81661531)

Multiplication

n×y
n×2 163323062
n×3 244984593
n×4 326646124
n×5 408307655

Division

n÷y
n÷2 40830765.5
n÷3 27220510.333333
n÷3 20415382.75
n÷5 16332306.2

Exponentiation

ny
n2 6668605645263961
n3 5.445685466275E+23
n4 4.4470301252046E+31
n5 3.6315128842733E+39

Nth Root

y√n
2√n 9036.6769888051
3√n 433.84957127408
4√n 95.061437969374
5√n 38.229930066748

Divisors of 81661531

1, 7, 607, 4249, 19219, 134533, 11665933, 81661531

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 -81661530
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 81661531 can be divided by 8 positive divisors. The sum of these divisors (counting 81661531) is 1, the average is 0.125.

Base conversion 81661531

Base System Value
2 Binary 100110111100000111001011011
3 Ternary 12200122211120011
4 Quaternary 10313200321123
5 Quinary 131401132111
6 Senary 12034142351
8 Octal 467407133
10 Decimal 81661531
12 Duodecimal 234219b7
16 Hexadecimal 4de0e5b
20 Vigesimal 15a7dgb
36 Base36 1cmafv

Cryptographic Hash Functions

md5 739b86992e8933243cda0d74968a5c29
sha1 2847f276542190142f1437d552b21a58fa800667
sha256 07755cb4d16a4ed15310247fd6cec86b5f1ef7542af83640b5793dd7671b95f1
sha512 576178ed08111a886b49163919b5d5f1cffee18a3fb1cd8c4c0c22264dfbc425e0724953c53547b2ecb3d6d1235d344b1a5419ea9475a882be30b6c7943b0f2b
ripemd-160 9d41c25ee7a2018272e60c935710126c8c7e0787

81661531 as geometric shapes

Circle

Radius = n
Diameter 163323062
Circumference 513094531.74099
Area 2.0950042504849E+16

Sphere

Radius = n
Volume 2.281083393948E+24
Surface area 8.3800170019395E+16
Circumference 513094531.74099

Square

Length = n
Perimeter 326646124
Area 6668605645263961
Diagonal 115486844.66435

Cube

Length = n
Surface area 40011633871583766
Volume 5.445685466275E+23
Space diagonal 141441920.71586

Equilateral Triangle

Length = n
Perimeter 244984593
Area 2.8875909483095E+15
Altitude 70720960.35793

Triangular Pyramid

Length = n
Surface area 2.8875909483095E+15
Volume 6.4178018690201E+22
Height 38495614.888117