On 9 March 2015, 17:49:18, PrimeGrid’s 27121 Prime Search, through PRPNet and in collaboration with the 12121 Search (k=27 sister project), has found the mega prime:
The prime is 1,569,463 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 38th overall.
The discovery was made by Hiroyuki Okazaki (zunewantan) of Japan using an Intel(R) Xeon(R) CPU E5-2648L 0 @ 1.80GHz Processor with 64GB RAM, running Microsoft Windows 7 Ultimate. This computer took about 5 hours and 5 minutes to complete the primality test using LLR. Hiroyuki is a member of the Aggie The Pew team.
For more details, please see the official announcement.