1519

Number
$1519$ (one thousand, five hundred and nineteen) is:
 * $7^2 \times 31$


 * The $23$rd centered hexagonal number after $1$, $7$, $19$, $37$, $61$, $91$, $127$, $\ldots$, $817$, $919$, $1027$, $1141$, $1261$, $1387$:
 * $1519 = \displaystyle 1 + \sum_{k \mathop = 1}^{23 - 1} 6 k = 23^3 - 22^3$