947

This number is a prime.

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The only 3-digit left-truncatable prime whereby removing the last digit gives double the number obtained by removing the first. [Leonardis]

947²=896809 is the smallest circular-digit prime square containing all possible circular digits (0, 6, 8, 9). It also contains as substrings the Cyclops prime 809 and its "blinded" cousin 89. [Leonardis]