2147483647
This number is a prime.
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2147483647 and 8191 are the only Mersenne prime numbers
corresponding to a prime (31) and its reversal (13). [Loungrides]
2147483647 is the 63rd Fibonacci 31-step number; the 1st odd prime of this type. Note that 2^31-1 = 2147483647,
making it the 8th Mersenne prime. [Loungrides]
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