4489

N is a whole number, a prime to the power of a prime. Each of its digits is also a prime to the power of a prime. What is N?

 There are several answers.  (I'm not sure if there are infinitely many or not.)

 The first 5 are  

                 4      8      9     49      4489

There are no others with fewer than 10 digits.

 

(I put this page under 4489 because it is the largest, which makes it the most fun.)