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Properties of the Number 81692

Eighty-One Thousand Six Hundred Ninety-Two

Basics

Value: 81691 → 81692 → 81693

Parity: even

Prime: No

Previous Prime: 81689

Next Prime: 81701

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 2 × 13 × 1571

Divisors: 1, 2, 4, 13, 26, 52, 1571, 3142, 6284, 20423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: 10011111100011100

Octal: 237434

Duodecimal: 3B338

Hexadecimal: 13f1c

Square: 6673582864

Square Root: 285.81812398796546

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

Triangle read by rows: T(n,k) is the number of partitions of the set {1,2,...,n} having k adjacent blocks of size 2, i.e., blocks of the form (i,i+1) (0 <= k <= floor(n/2)). A184174
Define two sequences by An = mex{Ai,Bi : 0 <= i < n}, Bn = Bn-1 + (An-An-1)(An-An-1+1), where the mex of a set is the smallest nonnegative integer not in the set. Sequence gives An. Bn is in A081693. A81692
Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically. A207513