Properties of the Number 81556

Eighty-One Thousand Five Hundred Fifty-Six

Basics

Value: 81555 → 81556 → 81557

Parity: even

Prime: No

Previous Prime: 81553

Next Prime: 81559

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 20389

Divisors: 1, 2, 4, 20389, 40778, 81556

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111010010100

Octal: 237224

Duodecimal: 3B244

Hexadecimal: 13e94

Square: 6651381136

Square Root: 285.5801113523139

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 such that k and k² use only the digits 1, 3, 5, 6 and 8. A137034

Next-to-last term in n-th row of A080504. A81556