219

Number
$219$ (two hundred and nineteen) is:


 * $3 \times 73$


 * The $42$nd lucky number:
 * $1, 3, 7, 9, 13, 15, 21, \ldots, 163, 169, 171, 189, 193, 195, 201, 205, 211, 219, \ldots$


 * The $2$nd of $4$ integers $n$ such that $n + 2 n$ can be expressed as a sum using each of the digits $1$ to $9$ exactly once each:
 * $219 + 438 = 657$


 * There are $219$ Fedorov groups.

Also see

 * 219 Fedorov Groups