Properties of the Number 51580

Fifty-One Thousand Five Hundred Eighty

Basics

Value: 51579 → 51580 → 51581

Parity: even

Prime: No

Previous Prime: 51577

Next Prime: 51581

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5 × 2579

Divisors: 1, 2, 4, 5, 10, 20, 2579, 5158, 10316, 12895

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100100101111100

Octal: 144574

Duodecimal: 25A24

Hexadecimal: c97c

Square: 2660496400

Square Root: 227.11230702011724

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

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise. A235573

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise. A235962

Number of (n+1) X (1+1) 0..1 arrays with the difference of the upper and lower median value of each 2 X 2 subblock in lexicographically nondecreasing order rowwise and columnwise. A235566

Number of subsets of {1..n} whose sum of squares of elements is a square. A336815

a(n) = (2·n+6)!!/6!!, related to A000165 (even double factorials). A51580