This number is a prime.

+ 524287 is the seventh Mersenne prime. [Dobb]

+ 524287 is the 39th Fibonacci 19-step number. Note that 2^19-1 = 524287, making it the 7th Mersenne prime. [Loungrides]

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

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