Properties of the Number 81371

Eighty-One Thousand Three Hundred Seventy-One

Basics

Value: 81370 → 81371 → 81372

Parity: odd

Prime: Yes

Previous Prime: 81359

Next Prime: 81373

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 81371

Divisors: 1, 81371

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011110111011011

Octal: 236733

Duodecimal: 3B10B

Hexadecimal: 13ddb

Square: 6621239641

Square Root: 285.25602535266455

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

Prime p such that p and p+2 are twin primes and p²+p-1 p²+p+1 are also twin primes. A228968

Primes p such that each of the numbers p^k for k=1..5 has exactly two 1s in its decimal representation. A175964

Number of rhyme schemes (see reference for precise definition). A127021

a(n) = ∑_{k >= 0} floor(n^2·k+1 / (2·k+1)!). A309104

Primes of the form 13·n²+3·n+1. A176783

Prime numbers containing the digit string 137. A190307

a(n) = ∑_{k >= 0} floor(n^2·k / (2·k)!). A309105

Binomial coefficients C(n,j) reduced modulo j, j=1,...n; read by rows, j=0 is omitted because of mod(n,0). A81371