981

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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

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $981$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $981$