Properties of the Number 81643

Eighty-One Thousand Six Hundred Forty-Three

Basics

Value: 81642 → 81643 → 81644

Parity: odd

Prime: No

Previous Prime: 81637

Next Prime: 81647

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 19 × 4297

Divisors: 1, 19, 4297, 81643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011101011

Octal: 237353

Duodecimal: 3B2B7

Hexadecimal: 13eeb

Square: 6665579449

Square Root: 285.7323922834091

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) = ∑_i=0..n ∑_j=0..n (-1)^i+j * (i+j)!/(i!j!). A120305

Integers congruent to 0, 1, 4 or 9 (mod 16) which are not squares. A81643