Properties of the Number 51665

Fifty-One Thousand Six Hundred Sixty-Five

Basics

Value: 51664 → 51665 → 51666

Parity: odd

Prime: No

Previous Prime: 51659

Next Prime: 51673

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 10333

Divisors: 1, 5, 10333, 51665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100100111010001

Octal: 144721

Duodecimal: 25A95

Hexadecimal: c9d1

Square: 2669272225

Square Root: 227.29936207565564

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

Triangle in which row n consists of the coefficients in ∑_m=0..n x^m * ∏_k=m+1..n (1-k·x), as read by rows. A248925

G.f.: A(x) = exp( ∑_n>=1 xⁿ/(1 - 2ⁿ*x)ⁿ / n ), a power series in·with integer coefficients. A156171

a(n) = n for n <= 2; for n > 2, a(n) = 2a(n-1) - a(n - floor( 1/2 + sqrt(2n) )). A96796

Duplicate of A028263. A51665