2281

Number
$2281$ (two thousand, two hundred and eighty-one) is:


 * The $339$th prime number


 * The index of the $17$th Mersenne prime after $2$, $3$, $5$, $7$, $13$, $17$, $19$, $31$, $61$, $89$, $107$, $127$, $521$, $607$, $1279$, $2203$:
 * $M_{2281} = 2^{2281} - 1 \approx 4 \cdotp 461 \times 10^{686}$