A prime number with identical digits is 11.
The prime number is 47 and 4+7 = 11
The number 11 is prime and has two identical digits.
Apart from 2, no even number is prime and no prime number is even.
The number is 23.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
It is: 97 minus 11 = 86