Properties of the Number 25809

Twenty-Five Thousand Eight Hundred Nine

Basics

Value: 25808 → 25809 → 25810

Parity: odd

Prime: No

Previous Prime: 25801

Next Prime: 25819

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 1229

Divisors: 1, 3, 7, 21, 1229, 3687, 8603, 25809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010011010001

Octal: 62321

Duodecimal: 12B29

Hexadecimal: 64d1

Square: 666104481

Square Root: 160.65179737556628

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

The RSEG2 triangle. A161739

Squares where knight moving to a lowest unvisited square on a spirally numbered board will have no available moves. A323714

Number of different strings of length n obtained from "abcdefg" by iteratively duplicating any substring. A137747

Fifth right hand column of the RSEG2 triangle A161739. A161741

G.f. A(x) satisfies: A(x) = x * ∏_k>=1 1/(1 - A(x^k))^k. A308369

Expansion of 1 / ((1 - 3·x)*(1 - 4·x)*(1 - 5·x)*(1 - 8·x)). A28027

Number of lattice paths from (0,0) to (n,n) that do not go above the diagonal x=y and consist of steps (h,v) with h, v prime or one. A308273

a(n) = 2·A276086(n) - A276086(A001065(n)), where A276086 is the primorial base exp-function, and A001065 is the sum of proper divisors of n. A379494

a(n) = A276086(1+n) - A276086(A001065(n)), where A276086 is the primorial base exp-function, and A001065 is the sum of proper divisors of n. A379498

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 1), (1, 1, 1)}. A149716