Properties of the Number 81908

Eighty-One Thousand Nine Hundred Eight

Basics

Value: 81907 → 81908 → 81909

Parity: even

Prime: No

Previous Prime: 81901

Next Prime: 81919

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 20477

Divisors: 1, 2, 4, 20477, 40954, 81908

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111110100

Octal: 237764

Duodecimal: 3B498

Hexadecimal: 13ff4

Square: 6708920464

Square Root: 286.19573721493475

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

Start with a square of dimension 1 X 1, and repeatedly append along the squares of the previous step squares with half their side length that do not overlap with any prior square; a(n) gives the number of squares appended at n-th step. A321237

a(n) = the least positive integer k such that ω(n+k) = ω(k)+n, where ω(m) (A001222) denotes the number of prime factors of m, counting multiplicity. A76158

a(n) = 2ⁿ*(n² - n + 8)/8. A81908