26991 (number)
26,991 (twentysix thousand nine hundred ninetyone) is an odd fivedigits composite number following 26990 and preceding 26992. In scientific notation, it is written as 2.6991 × 10^{4}. The sum of its digits is 27. It has a total of 3 prime factors and 6 positive divisors. There are 17,988 positive integers (up to 26991) that are relatively prime to 26991.
Basic properties
 Is Prime? No
 Number parity Odd
 Number length 5
 Sum of Digits 27
 Digital Root 9
Name
Short name  26 thousand 991 

Full name  twentysix thousand nine hundred ninetyone 
Notation
Scientific notation  2.6991 × 10^{4} 

Engineering notation  26.991 × 10^{3} 
Prime Factorization of 26991
Prime Factorization 3^{2} × 2999
Composite numberω(n)  Distinct Factors  2  Total number of distinct prime factors 

Ω(n)  Total Factors  3  Total number of prime factors 
rad(n)  Radical  8997  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  0  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 26,991 is 3^{2} × 2999. Since it has a total of 3 prime factors, 26,991 is a composite number.
Divisors of 26991
6 divisors
τ(n)  Total Divisors  6  Total number of the positive divisors of n 

σ(n)  Sum of Divisors  39000  Sum of all the positive divisors of n 
s(n)  Aliquot Sum  12009  Sum of the proper positive divisors of n 
A(n)  Arithmetic Mean  6500  Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) 
G(n)  Geometric Mean  164.28937884112  Returns the nth root of the product of n divisors 
H(n)  Harmonic Mean  4.1524615384615  Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors 
The number 26,991 can be divided by 6 positive divisors (out of which 0 are even, and 6 are odd). The sum of these divisors (counting 26,991) is 39,000, the average is 6,500.
Other Arithmetic Functions (n = 26991)
φ(n)  Euler Totient  17988  Total number of positive integers not greater than n that are coprime to n 

λ(n)  Carmichael Lambda  8994  Smallest positive number such that a^{λ(n)} ≡ 1 (mod n) for all a coprime to n 
π(n)  Prime Pi  ≈ 2957  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 17,988 positive integers (less than 26,991) that are coprime with 26,991. And there are approximately 2,957 prime numbers less than or equal to 26,991.
Divisibility of 26991
m  2  3  4  5  6  7  8  9 

n mod m  1  0  3  1  3  6  7  0 
The number 26,991 is divisible by 3 and 9.
Classification of 26991
By Arithmetic functions
 Arithmetic
 Deficient
Expressible via specific sums
 Polite
 Nonhypotenuse
Base conversion (26991)
Base  System  Value 

2  Binary  110100101101111 
3  Ternary  1101000200 
4  Quaternary  12211233 
5  Quinary  1330431 
6  Senary  324543 
8  Octal  64557 
10  Decimal  26991 
12  Duodecimal  13753 
16  Hexadecimal  696f 
20  Vigesimal  379b 
36  Base36  ktr 
Basic calculations (n = 26991)
Multiplication
n×yn×2  53982 

n×3  80973 
n×4  107964 
n×5  134955 
Division
n÷yn÷2  13495.500 

n÷3  8997.000 
n÷4  6747.750 
n÷5  5398.200 
Exponentiation
n^{y}n^{2}  728514081 

n^{3}  19663323560271 
n^{4}  530732766215274561 
n^{5}  14325008092916475675951 
Nth Root
^{y}√n^{2}√n  164.28937884112 

^{3}√n  29.996666296228 
^{4}√n  12.817541840818 
^{5}√n  7.6956231965462 
26991 as geometric shapes
Circle
Radius = nDiameter  53982 

Circumference  169589.45462608 
Area  2288694484.9063 
Sphere
Radius = nVolume  82365537122809 

Surface area  9154777939.6253 
Circumference  169589.45462608 
Square
Length = nPerimeter  107964 

Area  728514081 
Diagonal  38171.038262012 
Cube
Length = nSurface area  4371084486 

Volume  19663323560271 
Space diagonal  46749.783347092 
Equilateral Triangle
Length = nPerimeter  80973 

Area  315455850.58034 
Altitude  23374.891673546 
Triangular Pyramid
Length = nSurface area  1261823402.3213 

Volume  2317344905022.1 
Height  22038.05921582 
Cryptographic Hash Functions
md5  d9e6b46563c1a62a6d0979d929fe2e6b 

sha1  e4d102deb0054acb8c779a6e432860015a7e3500 
sha256  2394c5e53a47e13e2c3944376ad0b2867fe2ad61560003b5062a125a2ccfa9ad 
sha512  ebe47d270cba868ad69cecdb3e3ee4eccb3f47397c8404c2c303b492a2a495209823405220142e820fb7d4dd2e2c48add8d8ff4c1d00e772c4bb6389938a6b8d 
ripemd160  37dd583f7c9f12930bdd73410737461c5ae6938d 