688969169109181601
This number is a prime.
68896916 9109181601
Single Curio View: (Seek other curios for this number)
There are only 3 known multidigit strobogrammatic squares:
6889, 69169 and 109181601 (very likely to have no more
terms). Concatenating them in order gives a prime. [Gudipati]
Submitted: 2026-04-21 08:22:32; Last Modified: 2026-04-21 16:48:58.
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