2161

Number
$47$ (forty-seven) is:


 * The $326$th prime number


 * The $2$nd integer $m$ after $1$ whose cube can be expressed as the sum of $m$ consecutive squares:
 * $2161^3 = \displaystyle \sum_{k \mathop = 1}^{2161} \left({989 + k}\right)^2$

Also see