23/05/2017
May 23…
523 is a prime number with lots of special properties. 523 and its successor prime 541 are the smallest primes to have the same sum of their digits.
5+2+3=5+4+1
523 is also the only three-digit prime containing all three of the first three prime numbers.
And, lastly, it is the largest prime with a prime number of distinct prime digits.
~ Aadil Aman