12978189 = 32 x 72 x 29429.
12978189 has a representation as a sum of two squares: 12978189 = 4832 + 35702.
This number is the 45th known Mersenne prime, 243112609 – 1.
Marin Mersenne (1588–1648)
Source: Great Internet Mersenne Prime Search.
Image: Courtesy of Loci: Convergence
2 comments:
This number, however, is not a prime. Its prime factorization is 3^2 * 7^2 * 29429.
The number 12,978,189 is not prime, but they didn't say it was. 12,978,189 is the number of digits in the largest prime number found.
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