Properties of the Number 81045

Eighty-One Thousand Forty-Five

Basics

Value: 81044 → 81045 → 81046

Parity: odd

Prime: No

Previous Prime: 81043

Next Prime: 81047

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 1801

Divisors: 1, 3, 5, 9, 15, 45, 1801, 5403, 9005, 16209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110010010101

Octal: 236225

Duodecimal: 3AA99

Hexadecimal: 13c95

Square: 6568292025

Square Root: 284.6840353795766

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

Numbers k such that k-4, k-2, k+2 and k+4 are prime. A173037

The Wiener index of the para-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references). A216112

10th binomial transform of (1,9,0,0,0,0,0,...). A81045

Number of nX7 binary arrays without the pattern 0 1 0 antidiagonally or horizontally. A189062