17
This number is a prime.
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The smallest multidigit prime which requires exactly a prime number of letters to spell in both English and Latin ("seventeen" has 19 letters, and "septemdecim" has 11 letters). [Post]
The smallest prime factor of the semiprime 17#-1 is the reversal of 17-1. [Post]
(There are 3 curios for this number that have not yet been approved by an editor.)
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