1695

Number
$1695$ (one thousand, six hundred and ninety-five) is:


 * $3 \times 5 \times 113$


 * The magic constant of a magic square of order $15$, after $1$, $(5)$, $15$, $34$, $65$, $111$, $175$, $260$, $369$, $505$, $671$, $870$, $1105$, $1379$:
 * $\ds 1695 = \dfrac 1 {15} \sum_{k \mathop = 1}^{15^2} k = \dfrac {15 \paren {15^2 + 1} } 2$