Properties of the Number 81631

Eighty-One Thousand Six Hundred Thirty-One

Basics

Value: 81630 → 81631 → 81632

Parity: odd

Prime: No

Previous Prime: 81629

Next Prime: 81637

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 11 × 41 × 181

Divisors: 1, 11, 41, 181, 451, 1991, 7421, 81631

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 10011111011011111

Octal: 237337

Duodecimal: 3B2A7

Hexadecimal: 13edf

Square: 6663620161

Square Root: 285.7113928424976

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

Numbers k for which φ(A267099(k)) is equal to φ(k), but the number of 4m+1 and 4m+3 primes in the prime factorization of k (when counted with multiplicity) is not equal. Here A267099 is fully multiplicative involution swapping the positions of 4m+1 and 4m+3 primes, and φ is Euler totient function. A354194

Strong pseudoprimes to base 42. A20268

Positions of A080313 in A014486. A80312

Heptagonal numbers which are products of three distinct primes. A356422

a(n) = 2·2ⁿ - (-2)ⁿ. A81631