Properties of the Number 81655

Eighty-One Thousand Six Hundred Fifty-Five

Basics

Value: 81654 → 81655 → 81656

Parity: odd

Prime: No

Previous Prime: 81649

Next Prime: 81667

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 7 × 2333

Divisors: 1, 5, 7, 35, 2333, 11665, 16331, 81655

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011110111

Octal: 237367

Duodecimal: 3B307

Hexadecimal: 13ef7

Square: 6667539025

Square Root: 285.753390181114

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 31·2^k-1 is prime. A50541

Let spm(n) be the sum of all prime factors of n counted with multiplicities (A001414); sequence gives numbers n such that spm(n+spm(n)) divides both n and n+spm(n). A131564

a(n) = 2·5ⁿ-1. A81655