909090909090909091
This number is a prime.
90909090 9090909091
(1019 + 1)/11. (Like the number itself, this contains only the digits 0, 1, and 9.) [Pickover]
The only known prime that is the quotient of a repunit number divided by the product of two repunit primes, i.e.,
R38/(R2*R19). [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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