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(just those submitted by Gupta)
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+ 5 is the 5th digit in the decimal expansion of pi = 3.1415.... [Gupta]

+ The only prime which is the difference of two prime squares. [Gupta]

+ The only prime digit in which a perfect square can end. [Gupta]

+ !5 - 1 is prime. Note that !5 represents subfactorial 5. [Gupta]

+ The only prime that is sandwiched between two semiprimes. [Gupta]

+ The floor function of e^phi = 5, where phi is golden ratio. [Gupta]

+ Largest known number (coincidentally prime) such that 5! is a triangular number (i.e., 5! = 120). [Gupta]

+ SOUTH AMERICA is the only continent with all 5 vowels in its name. [Gupta]

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

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