Properties of the Number 80991

Eighty Thousand Nine Hundred Ninety-One

Basics

Value: 80990 → 80991 → 80992

Parity: odd

Prime: No

Previous Prime: 80989

Next Prime: 81001

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 8999

Divisors: 1, 3, 9, 8999, 26997, 80991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110001011111

Octal: 236137

Duodecimal: 3AA53

Hexadecimal: 13c5f

Square: 6559542081

Square Root: 284.5891775876237

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 p of [n] such that p(i) > p(i+1) iff i == 0 (mod 6). A250283

Expansion of 1/(1 + 1/(1 - x) - ∏_k>=1 (1 + x^k)). A317536

Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order. A227259

Ratios of successive terms of A080989. A80991