Properties of the Number 81985

Eighty-One Thousand Nine Hundred Eighty-Five

Basics

Value: 81984 → 81985 → 81986

Parity: odd

Prime: No

Previous Prime: 81973

Next Prime: 82003

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 5 × 19 × 863

Divisors: 1, 5, 19, 95, 863, 4315, 16397, 81985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000001000001

Octal: 240101

Duodecimal: 3B541

Hexadecimal: 14041

Square: 6721540225

Square Root: 286.3302289315608

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 containing only 1's and 0's in their base-2, base-3, and base-4 representations. A258981

Numbers k such that (7·10^k + 107)/3 is prime. A282667

Hypotenuses of primitive Pythagorean triangles with even short leg (or odd long leg) sorted on semiperimeter. A81985