Properties of the Number 218

Two Hundred Eighteen

Basics

Value: 217 → 218 → 219

Parity: even

Prime: No

Previous Prime: 211

Next Prime: 223

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 × 109

Divisors: 1, 2, 109, 218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11011010

Octal: 332

Duodecimal: 162

Hexadecimal: da

Square: 47524

Square Root: 14.7648230602334

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

a(n) = 6·n² + 2 for n > 0, a(0)=1. A5897

Positive integers congruent to 2 (mod 4): a(n) = 4·n+2, for n >= 0. A16825

The primes doubled; even semiprimes. A100484

Finitary numbers. Matula-Goebel numbers of rooted identity trees. A276625

Nontotients: even numbers k such that φ(m) = k has no solution. A5277

Sum of remainders of n mod k, for k = 1, 2, 3, ..., n. A4125

Numbers that are the sum of 3 positive cubes. A3072

Number of complete partitions of n. A126796

Numbers k such that k and k+1 have the same number of divisors. A5237

Indices k such that (1/3)*(prime(k)+prime(k+1)+prime(k+2)) is a prime. A64113