Properties of the Number 81747

Eighty-One Thousand Seven Hundred Forty-Seven

Basics

Value: 81746 → 81747 → 81748

Parity: odd

Prime: No

Previous Prime: 81737

Next Prime: 81749

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 31 × 293

Divisors: 1, 3, 9, 31, 93, 279, 293, 879, 2637, 9083

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111101010011

Octal: 237523

Duodecimal: 3B383

Hexadecimal: 13f53

Square: 6682572009

Square Root: 285.91432283115864

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(1)=3, a(2)=1, a(n) = 3·a(n-1) + a(n-2). A189735

Number of hierarchical orderings with at least 2 elements on each level for n unlabeled elements. Unlabeled analog of A097236. A109509

a(n+2) = 3·a(n) - a(n-2) with a(0) = 1, a(1) = 3, a(2) = 6. A18186

a(n) = A081746(n) - n. A81747