Properties of the Number 55561

Fifty-Five Thousand Five Hundred Sixty-One

Basics

Value: 55560 → 55561 → 55562

Parity: odd

Prime: No

Previous Prime: 55547

Next Prime: 55579

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 11 × 5051

Divisors: 1, 11, 5051, 55561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101100100001001

Octal: 154411

Duodecimal: 281A1

Hexadecimal: d909

Square: 3087024721

Square Root: 235.71380952332854

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

Numbers k such that k, k+2, k+4, k+6, k+8, k+10 are semiprimes. A92128

G.f.: ∏_n>=1 [ (1 - 2ⁿ*xⁿ) / (1 - (n+2)ⁿ*xⁿ) ]^1/n. A205814

Least semiprime whose prime factors differ by n!. A190801

Numbers m such that there are precisely 3 groups of order m. A55561

a(n) = ∑_k=1..n binomial(n,k) * σ(n,k) * 2^n-k. A205815