1571

This number is a prime.

+ 1571 is the only known prime of form (p!/p# + 1)/p. [Luhn]

+ 1571 = prime(π(1!!*5!!*7!!*1!!)). It is the only known multidigit number with this property. [Firoozbakht]

(There are 3 curios for this number that have not yet been approved by an editor.)

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