Properties of the Number 51811

Fifty-One Thousand Eight Hundred Eleven

Basics

Value: 51810 → 51811 → 51812

Parity: odd

Prime: No

Previous Prime: 51803

Next Prime: 51817

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 197 × 263

Divisors: 1, 197, 263, 51811

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101001100011

Octal: 145143

Duodecimal: 25B97

Hexadecimal: ca63

Square: 2684379721

Square Root: 227.6202978646676

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

Expansion of 1/(1 - 2·x + 9·x²). A127357

Expansion of g.f.: 1/(1 + 2·x + 9·x²). A25170

Transform of the finite sequence (1, 0, -1, 0, 1) by the T_1,0 transformation (see link). A159337

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 87 ones. A31855

G.f.: A(x) = exp( ∑_n>=1 A179307(n)*xⁿ/n ), where A179307(n) = ∑_d∣n C(n,d)*σ(d)*σ(n/d). A179306

Numbers with nonzero multiplicative digital root 9. A51811