127 (the 31st prime)

 
Next prime131
Previous prime113
Octal(177)8
Hexadecimal(7F)16
Prime gap4
12th Cousin prime (the small number)The big number is 131 .
14th Prime of the Form 3n+1102 + 3 * 32
16th Prime of the Form 4n+3 
4th Mersenne prime27 - 1