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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 1871 is the smallest prime factor of (3^171)/2. The Paris Commune of 1871 was the first attempt at a socialist society. 1871!/1781!  1 is prime. [Patterson] The great Chicago fire erupted in 1871. [Green] The least prime p congruent to 11 mod 12 such that (p1)/2 does not divide the numerator of the Bernoulli number B(p1). [Wesolowski] Portmanteau words like repdigit (from repeated and digit) can be traced to Lewis Carrol's book Through the LookingGlass (1871). After all, he was quite a mathlete.
(There is one curio for this number that has not yet been approved by an editor.)
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