Properties of the Number 81580

Eighty-One Thousand Five Hundred Eighty

Basics

Value: 81579 → 81580 → 81581

Parity: even

Prime: No

Previous Prime: 81569

Next Prime: 81611

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 4079

Divisors: 1, 2, 4, 5, 10, 20, 4079, 8158, 16316, 20395

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111010101100

Octal: 237254

Duodecimal: 3B264

Hexadecimal: 13eac

Square: 6655296400

Square Root: 285.6221279943135

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 j > 1 at which the absolute difference between log(j)*log(A341651(j)) and the nearest integer reaches a record low. A341652

Numbers m such that σ(m+1)+σ(m-1) = 6*φ(m). A67243

Pascal-(1,5,1) array. A81580