Properties of the Number 81395

Eighty-One Thousand Three Hundred Ninety-Five

Basics

Value: 81394 → 81395 → 81396

Parity: odd

Prime: No

Previous Prime: 81373

Next Prime: 81401

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 73 × 223

Divisors: 1, 5, 73, 223, 365, 1115, 16279, 81395

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110111110011

Octal: 236763

Duodecimal: 3B12B

Hexadecimal: 13df3

Square: 6625146025

Square Root: 285.29808972371336

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

Number of integer partitions of n with non-biquanimous multiplicities. A371840

The five digits of a(n) and their four successive absolute first differences are all distinct. A365257

a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ] and s = (Fibonacci numbers). A25078

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (Fibonacci numbers), t = (F(2), F(3), F(4), ...). A25082

Numbers whose base-5 representation has exactly 8 runs. A43608

a(n) is the smallest value of k such that number of non-unitary prime divisors of k-th Catalan number, A000108(k) = C(2·k,k)/(k+1) equals n. A81395