2531
This number is a prime.
This prime permutes the first 4 noncomposite digits, and
inserting operators becomes 2^53 - 1 = 9007199254740991;
the largest prime that is currently supported by this
site's JavaScript program. [Post]
2531 = 7^3 + 1 + 3^7. [Leonardis]
(There are 3 curios for this number that have not yet been approved by an editor.)
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