Properties of the Number 51981

Fifty-One Thousand Nine Hundred Eighty-One

Basics

Value: 51980 → 51981 → 51982

Parity: odd

Prime: No

Previous Prime: 51977

Next Prime: 51991

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 17327

Divisors: 1, 3, 17327, 51981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101100001101

Octal: 145415

Duodecimal: 260B9

Hexadecimal: cb0d

Square: 2702024361

Square Root: 227.99342095771098

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

Surround numbers of an n X 2 rectangle when n is odd. A61525

Twin prime products minus 2. A124659

Numbers k such that φ(k, 2) = φ(k+1, 2), where φ(k, 2) = A002472(k). A301868

a(n) = ∑_k=0..n (k+1) * A026780(n, k). A27251

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 16. A51981