9127
This number is a prime.
9127 is the largest 4-digit prime p with this property: p-1
and p+1 both have at least one prime with an exponent of 3
in their prime factorization. 9126 = 2 x 3^3 x 12^2 and
9128 = 2^3 x 7 x 163. [Keith]
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