Properties of the Number 81766

Eighty-One Thousand Seven Hundred Sixty-Six

Basics

Value: 81765 → 81766 → 81767

Parity: even

Prime: No

Previous Prime: 81761

Next Prime: 81769

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 40883

Divisors: 1, 2, 40883, 81766

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111101100110

Octal: 237546

Duodecimal: 3B39A

Hexadecimal: 13f66

Square: 6685678756

Square Root: 285.9475476376743

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) = a(n-1) + a(n-2) + n, a(0) = a(1) = 1. A30119

Number of multisets of exactly two nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter. A294004

Indices of primes in sequence defined by A(0) = 43, A(n) = 10·A(n-1) + 33 for n > 0. A101730

Numbers k such that k and k² use only the digits 1, 5, 6, 7 and 8. A137060

Number of strictly increasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero. A188124

Numbers k such that k²+1 divides C(2k,k). A81766