19910...10801 (81-digits)

This number is a prime.

                                                                1 9910968119
9089061198 9988811989 6961119889 1991198888 6011988168 1119866819 1198610801

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The smallest prime P formed from the reverse concatenation of n consecutive n-digit bemirps, i.e., {199109681, 199089061, 198998881, 198969611, 198891991, 198888601, 198816811, 198668191, 198610801}, (case n=9). Curiously, P is also expressible is sum of two squares. [Bajpai]