Properties of the Number 81521

Eighty-One Thousand Five Hundred Twenty-One

Basics

Value: 81520 → 81521 → 81522

Parity: odd

Prime: No

Previous Prime: 81517

Next Prime: 81527

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 11 × 7411

Divisors: 1, 11, 7411, 81521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001110001

Octal: 237161

Duodecimal: 3B215

Hexadecimal: 13e71

Square: 6645673441

Square Root: 285.5188259992675

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) = number of regions in the configuration A290447(n). A290865

Triangle read by rows: row n contains n terms in increasing order, relatively prime to n, whose sum is a multiple of n and such that the row contains the smallest possible subset of consecutive numbers starting with 1. A81521