Properties of the Number 81999

Eighty-One Thousand Nine Hundred Ninety-Nine

Basics

Value: 81998 → 81999 → 82000

Parity: odd

Prime: No

Previous Prime: 81973

Next Prime: 82003

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 3037

Divisors: 1, 3, 9, 27, 3037, 9111, 27333, 81999

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000001001111

Octal: 240117

Duodecimal: 3B553

Hexadecimal: 1404f

Square: 6723836001

Square Root: 286.3546751844642

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

Triangle read by rows: T(n, k) = 10^n-1 - 1 + k·floor(9·10^n-1/n), for 1 <= k <= n. A93846

First row of array in A081998. A81999