81661 (number)

81661 is an odd 5-digits composite number following 81660 and preceding 81662. In scientific notation, it is written as 8.1661 × 10^4. The sum of its digits is 22. It has a total of 2 prime factors and 4 positive divisors. There are 80892 positive integers (up to 81661) that are relatively prime to 81661.

Interesting facts

Basic properties

Name

Name eighty-one thousand six hundred sixty-one

Notation

Scientific notation 8.1661 × 10^4
Engineering notation 8.1661 × 10^3

Prime Factorization of 81661

Prime Factorization 127 × 643

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 81661
Product of the distinct prime numbers

The prime factorization of 81661 is 127 × 643. Since it has a total of 2 prime factors.

Most popular turbo-numbers

10, 8, 70, 34, 136, 876, 6699, 4252, 47002, 44901, 328765, 748838, 407928, 6824441, 20536124, 13628547, 844618519, 517465051, 1062666053, 9084341466

Basic calculations (n = 81661)

Multiplication

n×y
n×2 163322
n×3 244983
n×4 326644
n×5 408305

Division

n÷y
n÷2 40830.5
n÷3 27220.333333333
n÷3 20415.25
n÷5 16332.2

Exponentiation

ny
n2 6668518921
n3 544557923607781
n4 4.4469144599735E+19
n5 3.631394817159E+24

Nth Root

y√n
2√n 285.76388855137
3√n 43.384863091037
4√n 16.904552302601
5√n 9.6029117726834

Divisors of 81661

1, 127, 643, 81661

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 -81660
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 81661 can be divided by 4 positive divisors. The sum of these divisors (counting 81661) is 1, the average is 0.25.

Base conversion 81661

Base System Value
2 Binary 10011111011111101
3 Ternary 11011000111
4 Quaternary 103323331
5 Quinary 10103121
6 Senary 1430021
8 Octal 237375
10 Decimal 81661
12 Duodecimal 3b311
16 Hexadecimal 13efd
20 Vigesimal a431
36 Base36 1r0d

Cryptographic Hash Functions

md5 b0b63a2cf5c5f89e1bae6ef3d9a6965c
sha1 3aa40ae5f1eed190fe5a564eb16d21d64d234ab0
sha256 0c8f0177644197b342eee3338b6ce769cedae9ff22ccfc18eb5ddfd00b7e2b4a
sha512 4c66ca5070eaae62c6344c4652073296ed6325161b5cf68350819e0f9d16a5d3045720ee87e90dd3ce6abe7e33d15cfc1c84c65846836c92af72f70e5f9a37a5
ripemd-160 a6668ca889a29a38da3aec2e01a4dbb9de17c75e

81661 as geometric shapes

Circle

Radius = n
Diameter 163322
Circumference 513091.19536959
Area 20949770052.538

Sphere

Radius = n
Volume 2.2810388963471E+15
Surface area 83799080210.153
Circumference 513091.19536959

Square

Length = n
Perimeter 326644
Area 6668518921
Diagonal 115486.09371695

Cube

Length = n
Surface area 40011113526
Volume 544557923607781
Space diagonal 141441.00099688

Equilateral Triangle

Length = n
Perimeter 244983
Area 2887553395.6016
Altitude 70720.500498441

Triangular Pyramid

Length = n
Surface area 2887553395.6016
Volume 64176766755321
Height 38495.364572316