Properties of the Number 81287

Eighty-One Thousand Two Hundred Eighty-Seven

Basics

Value: 81286 → 81287 → 81288

Parity: odd

Prime: No

Previous Prime: 81283

Next Prime: 81293

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 29 × 2803

Divisors: 1, 29, 2803, 81287

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110000111

Octal: 236607

Duodecimal: 3B05B

Hexadecimal: 13d87

Square: 6607576369

Square Root: 285.10875118101865

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 partitions of n whose minimal excluded multiplicity is odd. A300183

Numbers k such that 2·10^k + 93 is prime. A275523

Excess area when consecutive squares of sizes 1 to n are packed into the smallest possible rectangle. A81287

Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5). A359871