Properties of the Number 81317

Eighty-One Thousand Three Hundred Seventeen

Basics

Value: 81316 → 81317 → 81318

Parity: odd

Prime: No

Previous Prime: 81307

Next Prime: 81331

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 233 × 349

Divisors: 1, 233, 349, 81317

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110100101

Octal: 236645

Duodecimal: 3B085

Hexadecimal: 13da5

Square: 6612454489

Square Root: 285.1613578309656

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

Semiprimes of the form n*(3·n-1)/2. A245365

Semiprimes of the form (4·n + 1)*(6·n + 1) = 24·n² + 10·n + 1. A255584

Pentagonal numbers (A000326) that are also brilliant numbers (A078972). A113941

Strong pseudoprimes to base 28. A20254

Strong pseudoprimes to base 52. A20278

Primes p such that p divides 10ⁿ-1, p is the largest prime producing decimal fraction period n and p is not the largest prime dividing 10ⁿ-1. A81317