This number is a prime.

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The only six-digit invertible prime p formed from the reverse concatenation of two three-digit consecutive strobogrammatic primes: {619, 181}. Curiously, p is also expressible as the sum of two squares: (659^2 + 430^2). [Jha]

Submitted: 2019-02-22 10:09:12;   Last Modified: 2019-02-22 10:55:09.
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