This number is a prime.
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]
2147483647 = 46341 * 46341 - 4634*1. [Morgan]
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]
The first Honaker number that is also a Mersenne prime. Can you find another? [Bajpai]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell