1789

This number is a prime.

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The largest emirp formed from the sum of two digits followed from a concatenation of these digits. [Loungrides]

The smallest emirp whose sum of digits is an odd composite number. [Loungrides]

The "Storming of the Bastille" occurred in 1789. [Loungrides]

Another emirp is created if the internal digits of 1789 are switched. It is the smallest 4-digit distinct-digit emirp with this property. [Loungrides]