31172165
This number is a composite.
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10223*2^31172165 + 1 is a 9383761-digit proven prime . It
is neither the largest known prime nor a self number. BUT,
10223*2^31172165 + 1 is the largest known prime P such that
the repunit number ( 10^P - 1)/9 is a self number (!), as
of July 4 , 2019. [Kontobesar]
Submitted: 2019-07-06 03:20:32; Last Modified: 2019-07-06 13:16:02.
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