Properties of the Number 81657

Eighty-One Thousand Six Hundred Fifty-Seven

Basics

Value: 81656 → 81657 → 81658

Parity: odd

Prime: No

Previous Prime: 81649

Next Prime: 81667

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 43 × 211

Divisors: 1, 3, 9, 43, 129, 211, 387, 633, 1899, 9073

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011111001

Octal: 237371

Duodecimal: 3B309

Hexadecimal: 13ef9

Square: 6667865649

Square Root: 285.75688968072143

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

G.f. A(x) satisfies A(x) = 1 / ((1 - x) * (1 - 2·x * (1 + x + x²) * A(x³))). A390657

a(n) = 2·7ⁿ-3ⁿ. A81657