Properties of the Number 25591

Twenty-Five Thousand Five Hundred Ninety-One

Basics

Value: 25590 → 25591 → 25592

Parity: odd

Prime: No

Previous Prime: 25589

Next Prime: 25601

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 157 × 163

Divisors: 1, 157, 163, 25591

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001111110111

Octal: 61767

Duodecimal: 12987

Hexadecimal: 63f7

Square: 654899281

Square Root: 159.97187252764155

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Products of 2 successive primes. A6094

Expansion of k/(4·q^1/2) in powers of q, where k defined by sqrt(k) = theta₂(0, q)/theta₃(0, q). A1938

Expansion of q^-1/2 * (η(q⁴) / η(q))⁴ in powers of q. A93160

a(n) = prime(2·n-1)*prime(2·n). A89581

Product of the n-th sexy prime pair. A111192

Numbers n such that exactly two positive d in the range d <= n/2 exist which divide binomial(n-d-1, d-1) and which are not coprime to n. A178098

a(n) = A050376(n)*A050376(n+1) where A050376(n) is the n-th number of the form p^{2^k} with p is prime and k >= 0. A240521

Expansion of q * ψ(q⁸) / φ(-q) in powers of q where ψ(), φ() are Ramanujan θ functions. A123655

Expansion of ∑_k>=0 x^k / (1 - k·x³)^k+1. A360783

Let e_n(k)>=0 denote the exponent of prime(k) in the prime power representation of n. The sequence lists 1 followed by numbers n for which e_n(2·i-1)=e_n(2·i), for all i>=1. A275407