99999...81919 (100-digits)

This number is a prime.

9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999981919

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The largest emirp less than a googol using invertible digits only. [Bajpai]

Submitted: 2018-05-20 11:40:24; Last Modified: 2018-05-20 12:46:18.