109

This number is a prime.

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The smallest distinct-digit positive integer whose square has no unique digits. [Gaydos]

The Messerschmitt Bf 109 was the most-produced fighter aircraft in history. [Gaydos]

None of the 109 consecutive integers from 6498130362 to 6498130470 are semiprimes. [Gaydos]

3^109 is in a prime gap of length 109. [Gaydos]