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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 2147483647 and 8191 are the only Mersenne prime numbers corresponding to a prime (31) and its reversal (13). [Loungrides] M_{31} = 2^31  1 = 0x7FFFFFFF. It also happens to be the largest signed 32bit integer (available in many programing languages, i.e., C/C++ int on 32bit platforms). [Zenczykowski] The first prime that cannot be tested on 32bit primalitycheck software. [Beedassy] 2147483647 is the 63rd Fibonacci 31step number; the 1st odd prime of this type. Note that 2^311 = 2147483647, making it the 8th Mersenne prime. [Loungrides]
(There are 2 curios for this number that have not yet been approved by an editor.)
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