37 (the 12th prime)

 
Next prime41
Previous prime31
Octal(45)8
Hexadecimal(25)16
Prime gap4
6th Prime triplet (the smallest number)The others are 41 and 43 .
5th Cousin prime (the small number)The big number is 41 .
8th Sexy prime (the small number)The big number is 43 .
5th Prime of the Form 3n+152 + 3 * 22
5th Prime of the Form 4n+112 + 62
4th Emirp (reversible prime) 
8th Left-truncatable prime 
8th Right-truncatable prime 
6th Two-sided prime