Properties of the Number 81381

Eighty-One Thousand Three Hundred Eighty-One

Basics

Value: 81380 → 81381 → 81382

Parity: odd

Prime: No

Previous Prime: 81373

Next Prime: 81401

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 27127

Divisors: 1, 3, 27127, 81381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110111100101

Octal: 236745

Duodecimal: 3B119

Hexadecimal: 13de5

Square: 6622867161

Square Root: 285.2735529277118

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

Sums of 5 distinct powers of 5. A38477

Numbers n such that n and τ(n) = A000005(n) have the same prime factors (ignoring multiplicity). A81381