Properties of the Number 18516

Eighteen Thousand Five Hundred Sixteen

Basics

Value: 18515 → 18516 → 18517

Parity: even

Prime: No

Previous Prime: 18503

Next Prime: 18517

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 1543

Divisors: 1, 2, 3, 4, 6, 12, 1543, 3086, 4629, 6172

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100001010100

Octal: 44124

Duodecimal: A870

Hexadecimal: 4854

Square: 342842256

Square Root: 136.07350954539243

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

Rotating digits of a(n)² right once still yields a square. A45877

Number of pentagons in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares). A332608

Numbers k such that x^k + x⁹ + 1 is irreducible over GF(2). A57479

Seventh convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself. A73377

a(n) = 529·n + 1. A158368

Number of lines through at least 2 points of a 7 X n grid of points. A160847

Starting positions of strings of three 7's in the decimal expansion of π. A83631

a(n+2) = 34·a(n+1) - a(n) + 2; a(1) = 1 and a(2) = 16. A131515

G.f.: A(x) = x/(1 - (1-3x)*A( x/(1-3x) )). A179489

Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A253431