981

Number
$981$ (nine hundred and eighty-one) is:


 * $3^3 \times 109$


 * The common sum of the only known set of $5$ triplets of integers with the property that the sum of the integers in each triplet are equal and the product of the integers in each triplet are equal:
 * $\left({6, 480, 495}\right)$, $\left({11, 160, 810}\right)$, $\left({12, 144, 825}\right)$, $\left({20, 81, 880}\right)$, $\left({33, 48, 900}\right)$

Also see

 * Set of 5 Triplets whose Sums and Products are Equal
 * 1,425,600