Monday, July 29, 2013


858 = 2 x 3 x 11 x 13.

858 is the smallest palindrome with four distinct prime factors. Note that the reversal of each prime factor is itself a prime.

858 is 454 in base 14 (A029969).

858 is a Guiga number (A007850): a composite number n such that p divides n/p - 1 for every prime divisor p of n.

The sum of the squares of the first 858 primes is prime (A098561).

Source: Prime Curios!

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