11 (the 5th prime)

 
Next prime13
Previous prime7
Octal(13)8
Hexadecimal(B)16
Prime gap2
3rd Twin prime (the small number)The big number is 13 .
3rd Prime triplet (the smallest number)The others are 13 and 17 .
2nd Prime quadruplet (the smallest number)The others are 13 , 17 and 19 .
3rd Sexy prime (the small number)The big number is 17 .
3rd Prime of the Form 4n+3 
4th Sophie Germain prime 
3rd Safe prime