Properties of the Number 81808

Eighty-One Thousand Eight Hundred Eight

Basics

Value: 81807 → 81808 → 81809

Parity: even

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 5113

Divisors: 1, 2, 4, 8, 16, 5113, 10226, 20452, 40904, 81808

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110010000

Octal: 237620

Duodecimal: 3B414

Hexadecimal: 13f90

Square: 6692548864

Square Root: 286.0209782515961

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

Number of squares added at the n-th generation of a symmetric (with 45-degree angles), non-overlapping Pythagoras tree. A276677

Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order. A151594

Numbers m such that the largest prime power in the factorization of m equals φ(m). A81808