839

This number is a prime.

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The smallest multidigit prime p such that p*R(p)+1 is emirp, i.e., 839*938+1=786983. [Loungrides]

One hundred factorial minus 839 is prime. [Loungrides]

The smallest number which divided by 2 thru 8 leaves remainders 1 thru 7. [Loungrides]

The number 6*(10^839-1)/9-839 is the only non-titanic prime that consists of n 6’s minus n, for any integer n > 1. Note the form 6*(10^n-1)/9-n. [Loungrides]