This number is a composite.
1024651 = 19 x 199 x 271 is the first Carmichael Number more than a million. It is also the first more than one Meg, as it truncates on one side to 1024 = 2^10. Note that it is the smallest Carmichael Number for which the Prime Counting Function yields a palindrome: π(1024651) = 80308. The digital sum of 1024651 is the prime 19. The sum of prime factors is 19 + 199 + 271 = 489 = 3 x 163, hence the mean of the prime factors is the prime 163. [Carmichael]