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 is one curio for this number that has not yet been approved by an editor.)

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