524287
This number is a prime.
524287 is the seventh Mersenne prime. [Dobb]
524287 is the largest Mersenne prime which appears in the digits of another Mersenne prime. (It appears just one time in
2^82589933-1.) [Sariyar]
Between 1588 and 1772, the prime 524287 remained the “largest known prime” for 184 years! — and the
longest-known duration for which this record stayed unbroken. [Gudipati]
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