This number is a prime.
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In the range of primes from 2 to 2^32, the largest negative disparity between the count of the primes 4k+3, K3, against the count of the primes 4k+1, K1, occurs at the prime 951867557. A this point, K3-K1=-48 is a negative maximum on favor of the primes 4k+1, in the whole range. [Rivera]