6108689

This number is a prime.

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The smallest invertible prime p containing all of the invertible digits {0, 1, 6, 8, 9} such that (p + 2) is a twin prime, (p + 6) is a Sophie Germain prime, (p + 16) is a Honaker prime. Curiously, p can also be expressed as the sum of two squares: (2305^2 + 892^2). [Bajpai]