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(just those submitted by Gupta)
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+ Any number with only two positive divisors is a prime number. [Gupta]

+ The floor function of phi^phi = 2, where phi is Golden Ratio. [Gupta]

+ !2 + 1 is prime. Note that !2 represents subfactorial 2. [Gupta]

+ The smallest number and only prime such that prime(n)=sigma(n). [Gupta]

+ Only prime whose sum of divisors is odd. [Gupta]

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

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