Properties of the Number 25506

Twenty-Five Thousand Five Hundred Six

Basics

Value: 25505 → 25506 → 25507

Parity: even

Prime: No

Previous Prime: 25471

Next Prime: 25523

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 13 × 109

Divisors: 1, 2, 3, 6, 9, 13, 18, 26, 39, 78

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110001110100010

Octal: 61642

Duodecimal: 12916

Hexadecimal: 63a2

Square: 650556036

Square Root: 159.70597985047397

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 signed graphs with n nodes. Also number of 2-multigraphs on n nodes. A4102

Array read by descending antidiagonals: A(n,k) is the number of unoriented colorings of the edges of a regular n-dimensional simplex using up to k colors. A327084

Table T(n,k) giving number of k-multigraphs on n nodes (n >= 1, k >= 0) read by antidiagonals. A63841

a(n) = ∑_k=0..n binomial(n,k)³ * Stirling2(2·k,k) * Stirling2(2·n-2·k,n-k). A384472

Sums of the products of n consecutive pairs of numbers. A135036

Numbers k such that ∑_d∣k σ(d)³/d is an integer, where d are the divisors of k. A226566

Number of fault-free domino tilings (or dimer coverings) of a 2n X 2n square. A124997

a(n) = (2·n³ + 9·n² + n + 24) / 6. A160805

Expansion of e.g.f. ∑_k>=1 (exp(x) - 1)^k / (k * (1 - (exp(x) - 1)^k)²). A330449

E.g.f. satisfies A(x) = exp( 3 * (exp(x) - 1) * A(x)^1/3 ). A375877