Properties of the Number 25621

Twenty-Five Thousand Six Hundred Twenty-One

Basics

Value: 25620 → 25621 → 25622

Parity: odd

Prime: Yes

Previous Prime: 25609

Next Prime: 25633

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 25621

Divisors: 1, 25621

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010000010101

Octal: 62025

Duodecimal: 129B1

Hexadecimal: 6415

Square: 656435641

Square Root: 160.0656115472652

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

Primes p such that continued fraction of (1 + sqrt(p))/2 has period 15: primes in A146338. A146360

Doubly balanced primes: primes which are averages of both their immediate and their second neighbors. A51795

Numbers k such that the decimal expansions of both k and k² have 1 as smallest digit and 6 as largest digit. A257197

T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4. A197409

Sum of the squarefree parts of the partitions of n into 9 parts. A309485

Primes p such that p-12, p and p+12 are consecutive primes. A53072

Primes p such that ∑_{k=PreviousPrime(p)..p} d(k) = ∑_{k=p..NextPrime(p)} d(k), where d(k) is the number of divisors function A000005. A353552

Primes that remain prime through 3 iterations of function f(x) = 8x + 5. A23293

Primes p of the form 420k + 1 for some k. A217587

Balanced primes of order one ending in 1. A303092