Properties of the Number 81683

Eighty-One Thousand Six Hundred Eighty-Three

Basics

Value: 81682 → 81683 → 81684

Parity: odd

Prime: No

Previous Prime: 81677

Next Prime: 81689

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 7 ² × 1667

Divisors: 1, 7, 49, 1667, 11669, 81683

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100010011

Octal: 237423

Duodecimal: 3B32B

Hexadecimal: 13f13

Square: 6672112489

Square Root: 285.80237927631043

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

Expansion of ∏_k>=1 1/((1 - x^k)*(1 - x^4·k)). A318027

a(n) = (a(n-1) - a(n-3))*7^(1+(-1ⁿ)/2) with a(6)=5, a(7)=4, a(8)=22. A215139

Numbers k such that k and k+1 have the same sum of powerful divisors (A183097) and this sum is larger than 1. A349063

a(n) = (10ⁿ - 9ⁿ - 8ⁿ - 7ⁿ + 4·6ⁿ)/2. A81683