Next prime | 13 |

Previous prime | 7 |

Octal | (13)_{8} |

Hexadecimal | (B)_{16} |

Prime gap | 2 |

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 |