Properties of the Number 81801

Eighty-One Thousand Eight Hundred One

Basics

Value: 81800 → 81801 → 81802

Parity: odd

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 61 × 149

Divisors: 1, 3, 9, 61, 149, 183, 447, 549, 1341, 9089

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111110001001

Octal: 237611

Duodecimal: 3B409

Hexadecimal: 13f89

Square: 6691403601

Square Root: 286.0087411251621

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) = 1; thereafter a(n) = ∑_{k = 1..n} a(k/gcd(n,k)). A333613

Natural number transform of Aitken's triangle. A127740

Partial sums of A078902. A172521

Decimal expansion of electron mass in kg. A81801