The book is now available! 2147483647
(another Prime Pages' Curiosity)
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+ 2147483647 and 8191 are the only Mersenne prime numbers corresponding to a prime (31) and its reversal (13). [Loungrides]

+ M31 = 2^31 - 1 = 0x7FFFFFFF. It also happens to be the largest signed 32-bit integer (available in many programing languages, i.e., C/C++ int on 32-bit platforms). [Zenczykowski]

+ The first prime that cannot be tested on 32-bit primality-check software. [Beedassy]

(There are 2 curios for this number that have not yet been approved by an editor.)

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