Properties of the Number 81272

Eighty-One Thousand Two Hundred Seventy-Two

Basics

Value: 81271 → 81272 → 81273

Parity: even

Prime: No

Previous Prime: 81239

Next Prime: 81281

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 10159

Divisors: 1, 2, 4, 8, 10159, 20318, 40636, 81272

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110101111000

Octal: 236570

Duodecimal: 3B048

Hexadecimal: 13d78

Square: 6605137984

Square Root: 285.082444215704

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

a(0) = 16, after which, if (2·a(n-1)) - 1 = ∏_{k >= 1} (p_k)^c_k then a(n) = ∏_{k >= 1} (p_k-1)^c_k, where p_k indicates the k-th prime, A000040(k). A246345

The number of permutations of length n sortable by 2 cut-and-paste moves. A228399

Downward vertical of triangular spiral in A051682. A81272