Prime Curios!: 1231

1231
(another Prime Pages' Curiosity)

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The smallest prime that can be represented as the sum of a prime and its reversal in three different ways. [Gupta]

The last "prime day" of the year is 12/31. [Hallyburton]

The smallest mountain emirp. [Loungrides]

The last two prime days of the year, 12/29 and the New Year's Eve prime, 12/31, form a 'twimirp' (a twin prime pair whose members are emirps). Submitted on 12/31. [Green]

There are exactly 1231 isomers of undecene (C₁₁H₂₂). [Gudipati]

(There are 2 curios for this number that have not yet been approved by an editor.)