Properties of the Number 51205

Fifty-One Thousand Two Hundred Five

Basics

Value: 51204 → 51205 → 51206

Parity: odd

Prime: No

Previous Prime: 51203

Next Prime: 51217

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 7 ² × 11 × 19

Divisors: 1, 5, 7, 11, 19, 35, 49, 55, 77, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1100100000000101

Octal: 144005

Duodecimal: 25771

Hexadecimal: c805

Square: 2621952025

Square Root: 226.28521825342457

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 domino tilings of 4 X (n-1) board. A5178

T(n,k) is the number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by k or less and triangles differing by a constant counted only once. A195220

Number of perfect matchings in graph P₁₁ X P_2n. A28473

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+119)² = y². A129837

Number of domino tilings of the 11 X n grid with upper left corner removed iff n is odd. A210724

Occurrences of decrease of the probability density P(n) of coprime numbers k,m, satisfying 1 <= k <= a(n) and 1 <= m <= a(n), and a(n) congruent to 1 (mod 2) and a(n) not congruent to 3 (mod 6). A280879

Number of n-digit numbers that have exactly 3 divisors. A379566

A linear divisibility sequence of the fourth order related to A003779. A241606

The odd edge of a primitive 3-simplex (0, b=A031173, c=A031174, d=A031175). A298047

Number of lower triangles of a 3 X 3 integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by n or less and triangles differing by a constant counted only once. A195221