Properties of the Number 81660

Eighty-One Thousand Six Hundred Sixty

Basics

Value: 81659 → 81660 → 81661

Parity: even

Prime: No

Previous Prime: 81649

Next Prime: 81667

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 1361

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111011111100

Octal: 237374

Duodecimal: 3B310

Hexadecimal: 13efc

Square: 6668355600

Square Root: 285.76213884977835

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 ways to choose 3 points that form an equilateral triangle from the A000292(n) points in a regular tetrahedral grid of side length n. A334581

Numbers k such that 147·2^k+1 is prime. A32423

Numbers n with property that n+41, n²+41 and n³+41 are all primes. A175260

Number of compositions of n into parts 3, 5 and 9. A245370

n+A001045(n+1). A81660