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:
 * $\tuple {6, 480, 495}$, $\tuple {11, 160, 810}$, $\tuple {12, 144, 825}$, $\tuple {20, 81, 880}$, $\tuple {33, 48, 900}$

Also see

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