Properties of the Number 51508

Fifty-One Thousand Five Hundred Eight

Basics

Value: 51507 → 51508 → 51509

Parity: even

Prime: No

Previous Prime: 51503

Next Prime: 51511

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 79 × 163

Divisors: 1, 2, 4, 79, 158, 163, 316, 326, 652, 12877

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100100100110100

Octal: 144464

Duodecimal: 25984

Hexadecimal: c934

Square: 2653074064

Square Root: 226.9537397797181

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

Hyper-Wiener index of a benzenoid consisting of a double-step zig-zag chain of n hexagons (n >= 2, s = 2123; see the Gutman et al. reference). A193396

Number of nonnegative integer 5 X 5 matrices with sum of elements equal to n, under row and column permutations. A52367

Triangle read by rows T(n, k) = ∑_h>=0 Bernoulli(h)*binomial(k+h-1, h)*abs(Stirling1(n, h+k))*n^h for n>=0 and 0<=k<=n. A339207

Numbers n such that 5·10ⁿ + 3 is prime. A96254

The number of trisubstitution products with composition C_n H_2n-1 X₂ Y. A159940

Magic sums of 4 X 4 magic squares composed of odd squares. A271582

a(n) = (iⁿ)*∑_k=0..n (k+1)*B_k*|s(n+2,k+2)|*(n+2)^k. A286483

Triangle of coefficients from a polynomial recursion with row sum near =2·5ⁿ: p(x,n)=(x + 1)*(p(x, n - 1) + 2·5^{n - 2}*(x + 5·x^Floor[n/2] + x^{n - 2})). A153354

Numbers k such that (91·10^k + 11)/3 is prime. A271822

Start with n; if palindrome, stop; otherwise add to itself with digits reversed; a(n) gives palindrome at which it stops, or -1 if no palindrome is ever reached. A33865