Properties of the Number 81625

Eighty-One Thousand Six Hundred Twenty-Five

Basics

Value: 81624 → 81625 → 81626

Parity: odd

Prime: No

Previous Prime: 81619

Next Prime: 81629

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 ³ × 653

Divisors: 1, 5, 25, 125, 653, 3265, 16325, 81625

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011011001

Octal: 237331

Duodecimal: 3B2A1

Hexadecimal: 13ed9

Square: 6662640625

Square Root: 285.70089254323307

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

Expansion of g.f. satisfying A(x) = A( x·A(x)⁴ + 5·x*A(x)⁵ )^1/5. A370546

Sum of n-th Lucas number (A000032(n)) and n-th Pell number (A000129(n)). A60405

Expansion of (1-3·x)/(1 - 4·x - x² + 3·x³). A52926

Expansion of ∏_k>=1 1/(1 - x^k*(k+1/2))^A072964(k). A321507

a(n) = 2·5ⁿ - 3ⁿ. A81625