Properties of the Number 51216

Fifty-One Thousand Two Hundred Sixteen

Basics

Value: 51215 → 51216 → 51217

Parity: even

Prime: No

Previous Prime: 51203

Next Prime: 51217

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ⁴ × 3 × 11 × 97

Divisors: 1, 2, 3, 4, 6, 8, 11, 12, 16, 22

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100100000010000

Octal: 144020

Duodecimal: 25780

Hexadecimal: c810

Square: 2623078656

Square Root: 226.30952255705017

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 isosceles triangles that can be formed from the n² points of n X n grid of points (or geoboard). A186434

Expansion of 1/(1-2·x-2·x²+2·x³). A77937

Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of edges in H_n. A370979

Expansion of (1/x) * Series_Reversion( x / ( (1+x)² * (1+2·x)² ) ). A371406

Expansion of 1/(1+2·x-2·x²-2·x³). A77981

Expansion of 1/(1 - x - x³ + x⁵). A123552

a(n) = ∑_k=m..n T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027948. A27959

Number of length 4+1 0..n arrays with the sum of the cubes of adjacent differences multiplied by some arrangement of +-1 equal to zero. A250231

Numbers of the form 5^x-y² >= 0. A51216