1729
This number is a composite.
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The largest number which is divisible by its prime sum of digits (19) and reversal (91)
happens to be Ramanujan's famous taxi-cab number
(1729 = 123 + 13 = 103 + 93).
It is the smallest number expressible as the sum of two positive cubes in two different ways.
Submitted: 1999-09-02 23:40:00; Last Modified: 2008-01-30 17:28:00.
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