Properties of the Number 81605

Eighty-One Thousand Six Hundred Five

Basics

Value: 81604 → 81605 → 81606

Parity: odd

Prime: No

Previous Prime: 81569

Next Prime: 81611

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 19 × 859

Divisors: 1, 5, 19, 95, 859, 4295, 16321, 81605

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111011000101

Octal: 237305

Duodecimal: 3B285

Hexadecimal: 13ec5

Square: 6659376025

Square Root: 285.6658887581785

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

Indices of primes in sequence defined by A(0) = 87, A(n) = 10·A(n-1) - 13 for n > 0. A101072

E.g.f. A(x) satisfies: ∑_n>=1 Moebius(n) * A(x)ⁿ/n = x. A204290

Numbers having at least one 0 in their ternary representation. A81605