1519

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


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