Properties of the Number 25421

Twenty-Five Thousand Four Hundred Twenty-One

Basics

Value: 25420 → 25421 → 25422

Parity: odd

Prime: No

Previous Prime: 25411

Next Prime: 25423

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 11 × 2311

Divisors: 1, 11, 2311, 25421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110001101001101

Octal: 61515

Duodecimal: 12865

Hexadecimal: 634d

Square: 646227241

Square Root: 159.439643752738

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

Number of set-systems covering a subset of {1..n} where every two covered vertices appear together in some edge (cointersecting). A327039

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001. A260248

a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is smallest prime dividing n. A137808

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001. A260241

a(n) = digsum(2^a(n-1)) with a(0) = 0. A330822

Equal count of primes congruent to 1 mod 4 and 3 mod 4 associated with primes in A007351 (the zero beginning the sequence indicates the prime 2). A92198

Least sum of 4 distinct positive cubes in exactly n ways. A25421

Number of symmetric 5 X 5 matrices of nonnegative integers with every row and column adding to n. A53494