6481

This number is a prime.

+ The smallest prime formed from the concatenation (in ascending order) of two consecutive squares. [Gupta]

+ The only prime formed in two ways, from a double-digit prime p by replacing each of its digits with its square, (p=89), and from a 3-digit prime q by replacing each of its digits with its cube, (q=421). [Loungrides]

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

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