Properties of the Number 81157

Eighty-One Thousand One Hundred Fifty-Seven

Basics

Value: 81156 → 81157 → 81158

Parity: odd

Prime: Yes

Previous Prime: 81131

Next Prime: 81163

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 81157

Divisors: 1, 81157

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110100000101

Octal: 236405

Duodecimal: 3AB71

Hexadecimal: 13d05

Square: 6586458649

Square Root: 284.8806767753826

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

a(n) is the position of the last two-tuple within the reverse lexicographic set of partitions of 2n and 2n+1, with a(1)-a(n) representing the positions of every 2-tuple partition of 2n and 2n+1. A216053

Primes p such that p⁴-p³+1 and p⁴-p³-1 are also primes. A238136

Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes. A64962

Primes p such that 1000p+1, 1000p+3, 1000p+7 and 1000p+9 are prime. A242562

Lesser p of a sexy prime pair such that (p-3)/2 is also the lesser prime of a sexy prime pair. A358571

Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506, with no fixed points of either A057163 or A057164. A81157

Numbers k such that (73·10^k + 413)/9 is prime. A290431