Properties of the Number 81863

Eighty-One Thousand Eight Hundred Sixty-Three

Basics

Value: 81862 → 81863 → 81864

Parity: odd

Prime: No

Previous Prime: 81853

Next Prime: 81869

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 71 × 1153

Divisors: 1, 71, 1153, 81863

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111000111

Octal: 237707

Duodecimal: 3B45B

Hexadecimal: 13fc7

Square: 6701550769

Square Root: 286.1171088907477

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 n-celled polyominoes with exactly 2 holes. A89454

Odd composite numbers k all of whose divisors larger than 1 are not binary palindromes (A006995) such that the divisors of the binary reversal of k (A030101) are the binary reversals of the divisors of k. A331664

a(n) = 2·nⁿ*cos(n·arcsin(sqrt(4·n²-1)/(2·n))) for n > 0 and a(0) = 2. A320519

Largest integer m such that m divides (sigma_2n+1(2k-1)-σ(2k-1)) for all k>=1. A81863