Properties of the Number 81865

Eighty-One Thousand Eight Hundred Sixty-Five

Basics

Value: 81864 → 81865 → 81866

Parity: odd

Prime: No

Previous Prime: 81853

Next Prime: 81869

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 7 × 2339

Divisors: 1, 5, 7, 35, 2339, 11695, 16373, 81865

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111001001

Octal: 237711

Duodecimal: 3B461

Hexadecimal: 13fc9

Square: 6701878225

Square Root: 286.1206039417644

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 polydrafters: a(n) is the number of polydrafters with n cells. A56842

Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 438", based on the 5-celled von Neumann neighborhood. A282221

a(n) = 384·n³ - 1184·n² + 1228·n - 427. A272131

a(n) = n*(n³ + 2·n² - 5·n + 10)/8. A294259

a(n) = sigma₇(2n-1). A81865