Properties of the Number 81530

Eighty-One Thousand Five Hundred Thirty

Basics

Value: 81529 → 81530 → 81531

Parity: even

Prime: No

Previous Prime: 81527

Next Prime: 81533

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 31 × 263

Divisors: 1, 2, 5, 10, 31, 62, 155, 263, 310, 526

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001111010

Octal: 237172

Duodecimal: 3B222

Hexadecimal: 13e7a

Square: 6647140900

Square Root: 285.5345863463829

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(n) = running sum of the first n harmonic numbers, multiplied by the LCM of 1..n. A81530

Number of nX6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically. A208499