100000007

This number is a prime.

+ 100000007 and 1000000007 are primes!

+ The largest prime factor of an odd perfect number must be at least 100000007. [Goto and Ohno]

+ The smallest Mersenne number to contain more than 10^8 digits is 2^332192831 - 1, which contains 100000007 digits. Oddly enough, 100000007 is the smallest prime number that is greater than 10^8. [Cuenta]

+ The smallest prime with 9 digits is a naughty emirp. [Hasler]

(There is one curio for this number that has not yet been approved by an editor.)

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