99499

This number is a composite.

Just showing those entries submitted by 'Loungrides': (Click here to show all)

The only palindrome composite-digit 2-sphenic number, i.e., 99499 = 29 * 47 * 73. Note that the concatenation in order and reverse order of its prime factors, i.e., 294773 and 734729 are both primes. [Loungrides]