Properties of the Number 81665

Eighty-One Thousand Six Hundred Sixty-Five

Basics

Value: 81664 → 81665 → 81666

Parity: odd

Prime: No

Previous Prime: 81649

Next Prime: 81667

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 16333

Divisors: 1, 5, 16333, 81665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111100000001

Octal: 237401

Duodecimal: 3B315

Hexadecimal: 13f01

Square: 6669172225

Square Root: 285.7708872506085

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

Expansion of 1/(1 + x*∏_k>=1 1/(1 - x^k)). A318581

Number T(n,k) of permutations of [n] where the minimal distance between elements of the same cycle equals k (k=n for the identity permutation in S_n); triangle T(n,k), n>=0, 0<=k<=n, read by rows. A276974

Smallest integer q for which there exists a fraction p/q containing n in its decimal expansion. A81665