Properties of the Number 81540

Eighty-One Thousand Five Hundred Forty

Basics

Value: 81539 → 81540 → 81541

Parity: even

Prime: No

Previous Prime: 81533

Next Prime: 81547

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ³ × 5 × 151

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111010000100

Octal: 237204

Duodecimal: 3B230

Hexadecimal: 13e84

Square: 6648771600

Square Root: 285.552096822979

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

Number of permutations of {1,2,...,n} in which each element follows its proper divisors. A16021

Expansion of 2/(3-sqrt(3-2·sqrt(1-4x))). A112520

Values of n such that n^a-+a are primes, a=7. A155022

Sum of terms in row n of A081539. A81540