Properties of the Number 81520

Eighty-One Thousand Five Hundred Twenty

Basics

Value: 81519 → 81520 → 81521

Parity: even

Prime: No

Previous Prime: 81517

Next Prime: 81527

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 5 × 1019

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001110000

Octal: 237160

Duodecimal: 3B214

Hexadecimal: 13e70

Square: 6645510400

Square Root: 285.51707479588674

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

Smallest k such that n⁸+k⁸, n⁴+k⁴, n²+k², n+k are simultaneously prime. A71564

Triangle read by rows in which row n consists of 1 and the n-1 smallest positive numbers having common factors with n. A81520