Properties of the Number 55205

Fifty-Five Thousand Two Hundred Five

Basics

Value: 55204 → 55205 → 55206

Parity: odd

Prime: No

Previous Prime: 55201

Next Prime: 55207

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 61 × 181

Divisors: 1, 5, 61, 181, 305, 905, 11041, 55205

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101011110100101

Octal: 153645

Duodecimal: 27B45

Hexadecimal: d7a5

Square: 3047592025

Square Root: 234.95744295510198

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

RMS values of the RMS numbers: a(n) is the root mean square of the divisors of A140480(n). A141812

a(n) = n * (2·n - 1)!! - ∑_k=0..n-1 a(k) * (2·n - 2·k - 1)!!. A4208

RMS values of the Primitive RMS numbers: a(n) is the Root Mean Square of the divisors of A141813(n). A141814

Double factorial of odd numbers: a(n) = (2·n-1)!! = 1·3*5*...*(2·n-1). A1147

Number of nonsquare divisors of n². A55205

a(0) = a(1) = 1, a(2) = x, a(3) = 2x², a(n) = x*(n-1)*a(n-1) + ∑_j=2..n-2 (j-1)*a(j)*a(n-j), n>=4 and for x = 2. A111088