Properties of the Number 81990

Eighty-One Thousand Nine Hundred Ninety

Basics

Value: 81989 → 81990 → 81991

Parity: even

Prime: No

Previous Prime: 81973

Next Prime: 82003

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 5 × 911

Divisors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000001000110

Octal: 240106

Duodecimal: 3B546

Hexadecimal: 14046

Square: 6722360100

Square Root: 286.3389599757602

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 (265·10^k + 17)/3 is prime. A272523

Numbers k that have no zero digits and such that both k+1 and (product of digits of k) + 1 are squares. A81990