8661 (number)
8,661 (eight thousand six hundred sixtyone) is an odd fourdigits composite number following 8660 and preceding 8662. In scientific notation, it is written as 8.661 × 10^{3}. The sum of its digits is 21. It has a total of 2 prime factors and 4 positive divisors. There are 5,772 positive integers (up to 8661) that are relatively prime to 8661.
Basic properties
 Is Prime? No
 Number parity Odd
 Number length 4
 Sum of Digits 21
 Digital Root 3
Name
Short name  8 thousand 661 

Full name  eight thousand six hundred sixtyone 
Notation
Scientific notation  8.661 × 10^{3} 

Engineering notation  8.661 × 10^{3} 
Prime Factorization of 8661
Prime Factorization 3 × 2887
Composite numberω(n)  Distinct Factors  2  Total number of distinct prime factors 

Ω(n)  Total Factors  2  Total number of prime factors 
rad(n)  Radical  8661  Product of the distinct prime numbers 
λ(n)  Liouville Lambda  1  Returns the parity of Ω(n), such that λ(n) = (1)^{Ω(n)} 
μ(n)  Mobius Mu  1  Returns:

Λ(n)  Mangoldt function  0  Returns log(p) if n is a power p^{k} of any prime p (for any k >= 1), else returns 0 
The prime factorization of 8,661 is 3 × 2887. Since it has a total of 2 prime factors, 8,661 is a composite number.
Divisors of 8661
4 divisors
τ(n)  Total Divisors  4  Total number of the positive divisors of n 

σ(n)  Sum of Divisors  11552  Sum of all the positive divisors of n 
s(n)  Aliquot Sum  2891  Sum of the proper positive divisors of n 
A(n)  Arithmetic Mean  2888  Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) 
G(n)  Geometric Mean  93.06449376642  Returns the nth root of the product of n divisors 
H(n)  Harmonic Mean  2.9989612188366  Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors 
The number 8,661 can be divided by 4 positive divisors (out of which 0 are even, and 4 are odd). The sum of these divisors (counting 8,661) is 11,552, the average is 2,888.
Other Arithmetic Functions (n = 8661)
φ(n)  Euler Totient  5772  Total number of positive integers not greater than n that are coprime to n 

λ(n)  Carmichael Lambda  2886  Smallest positive number such that a^{λ(n)} ≡ 1 (mod n) for all a coprime to n 
π(n)  Prime Pi  ≈ 1085  Total number of primes less than or equal to n 
r_{2}(n)  Sum of 2 squares  0  The number of ways n can be represented as the sum of 2 squares 
There are 5,772 positive integers (less than 8,661) that are coprime with 8,661. And there are approximately 1,085 prime numbers less than or equal to 8,661.
Divisibility of 8661
m  2  3  4  5  6  7  8  9 

n mod m  1  0  1  1  3  2  5  3 
The number 8,661 is divisible by 3.
Classification of 8661
By Arithmetic functions
 Arithmetic
 Semiprime
 Deficient
Expressible via specific sums
 Polite
 Nonhypotenuse
By Powers
 Square Free
Other numbers
 LucasCarmichael
Base conversion (8661)
Base  System  Value 

2  Binary  10000111010101 
3  Ternary  102212210 
4  Quaternary  2013111 
5  Quinary  234121 
6  Senary  104033 
8  Octal  20725 
10  Decimal  8661 
12  Duodecimal  5019 
16  Hexadecimal  21d5 
20  Vigesimal  11d1 
36  Base36  6ol 
Basic calculations (n = 8661)
Multiplication
n×yn×2  17322 

n×3  25983 
n×4  34644 
n×5  43305 
Division
n÷yn÷2  4330.500 

n÷3  2887.000 
n÷4  2165.250 
n÷5  1732.200 
Exponentiation
n^{y}n^{2}  75012921 

n^{3}  649686908781 
n^{4}  5626938316952241 
n^{5}  48734912763123359301 
Nth Root
^{y}√n^{2}√n  93.06449376642 

^{3}√n  20.536322675287 
^{4}√n  9.6469940274896 
^{5}√n  6.1307500128706 
8661 as geometric shapes
Circle
Radius = nDiameter  17322 

Circumference  54418.667945482 
Area  235660041.53791 
Sphere
Radius = nVolume  2721402159679.8 

Surface area  942640166.15165 
Circumference  54418.667945482 
Square
Length = nPerimeter  34644 

Area  75012921 
Diagonal  12248.503663713 
Cube
Length = nSurface area  450077526 

Volume  649686908781 
Space diagonal  15001.292044354 
Equilateral Triangle
Length = nPerimeter  25983 

Area  32481547.599038 
Altitude  7500.646022177 
Triangular Pyramid
Length = nSurface area  129926190.39615 

Volume  76566336474.528 
Height  7071.676887415 
Cryptographic Hash Functions
md5  919d2356219c1fa0c0bd560246532c72 

sha1  264be81b3a6dee19eb8b68a894d7050d94edf1a6 
sha256  ba64fc14ebb32368ef763cc24dfbabfaa7b23a3538bc0b8d3f1a690f281238df 
sha512  2021c12151f7cfd37898f1fb398c6a1d12c1053e43641234fd42319d83b27a079aa376c7d8ae20a9bd8eed608c2216157502abd5fde6a2257c1c5b1f8b73c22c 
ripemd160  113061a4d84aece0d663fb78ae3508def839564a 