Properties of the Number 25561

Twenty-Five Thousand Five Hundred Sixty-One

Basics

Value: 25560 → 25561 → 25562

Parity: odd

Prime: Yes

Previous Prime: 25541

Next Prime: 25577

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 25561

Divisors: 1, 25561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001111011001

Octal: 61731

Duodecimal: 12961

Hexadecimal: 63d9

Square: 653364721

Square Root: 159.8780785473731

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

Indices of prime Fibonacci numbers. A1605

Numbers k such that (4^k + 5^k)/9 is prime. A128335

Primes of the form 5k² + 5k + 1. A90562

Primes of the form 43·n² - 537·n + 2971 in order of increasing nonnegative values of n. A272285

Prime indices of prime Fibonacci numbers. A83668

Smallest prime factor of n! + 2ⁿ - 1. A139023

Prime numbers congruent to 49 or 121 modulo 240 representable by x² + 960·y². A325090

Numbers k such that 10⁹⁹⁹ + k is a (titanic) prime. A74282

Primes p such that the multiplicative order of 2 modulo p is (p-1)/10. A152310

Numbers k such that (15^k + 4^k)/19 is prime. A227049