Properties of the Number 81491

Eighty-One Thousand Four Hundred Ninety-One

Basics

Value: 81490 → 81491 → 81492

Parity: odd

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19 × 4289

Divisors: 1, 19, 4289, 81491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001010011

Octal: 237123

Duodecimal: 3B1AB

Hexadecimal: 13e53

Square: 6640783081

Square Root: 285.4662852247179

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

Odd numbers having no odd primes in their Collatz (3x+1) trajectory. A221475

Triangle read by rows in which the n-th row contains n terms of an arithmetic progression with a common difference of (n-1) and the first term of (n+1)-th row is 1 more than the last term of the n-th row. A81491