811
This number is a prime.
The smallest prime number that is a sum of primes beginning
and ending with the digit seven (811 = 7 + 7 + 797). [Capelle]
The largest minimal prime in base nine. [Rupinski]
The reverse concatenation 811 to 1 of first n consecutive numbers ending in 1, is the first prime number built in this way, (case n=82). [Loungrides]
The smallest prime concatenated in order from two successive strobogrammatic numbers. [Loungrides]
811 is the national call-before-you-dig phone number. [Bowser]
(There are 5 curios for this number that have not yet been approved by an editor.)
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