Properties of the Number 81800

Eighty-One Thousand Eight Hundred

Basics

Value: 81799 → 81800 → 81801

Parity: even

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 ² × 409

Divisors: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110001000

Octal: 237610

Duodecimal: 3B408

Hexadecimal: 13f88

Square: 6691240000

Square Root: 286.0069929215018

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(n) = ∑_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|). A331772

A generalized partition function. A2599

Decimal expansion of atomic unit of velocity in SI units (meters/second). A81800