Properties of the Number 51690

Fifty-One Thousand Six Hundred Ninety

Basics

Value: 51689 → 51690 → 51691

Parity: even

Prime: No

Previous Prime: 51683

Next Prime: 51691

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 1723

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 1723, 3446

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100100111101010

Octal: 144752

Duodecimal: 25AB6

Hexadecimal: c9ea

Square: 2671856100

Square Root: 227.35434897973693

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 ∏_k>=1 ((1 + k·x^k) / (1 - x^k))^k. A268502

Expansion of 1/sqrt((1-x⁵)² - 4·x²). A383568

a(n) = (5·n+9)(!⁵)/9(!⁵), related to A034301 ((5·n+2)(!⁵) quintic, or 5-factorials). A51690

Coefficients of ménage hit polynomials. A185