Properties of the Number 219

Two Hundred Nineteen

Basics

Value: 218 → 219 → 220

Parity: odd

Prime: No

Previous Prime: 211

Next Prime: 223

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 73

Divisors: 1, 3, 73, 219

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11011011

Octal: 333

Duodecimal: 163

Hexadecimal: db

Square: 47961

Square Root: 14.798648586948742

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

Lucky numbers. A959

a(n) = ∑_k=1..n floor(n/k); also ∑_k=1..n d(k), where d = number of divisors (A000005); also number of solutions to x·y = z with 1 <= x,y,z <= n. A6218

Binary palindromes: numbers whose binary expansion is palindromic. A6995

a(n) = 4·n + 3. A4767

Number of partitions of n into prime parts. A607

Triangle T(n,k) 0<=k<n : Number of compositions of n with k adjacent equal parts. A106356

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = least number > a(n-1) which is a unique sum of two distinct earlier terms. A2858

a(n) = 6·n+3. A16945

Odd numbers of the form p·q where p and q are distinct primes. A46388