Next prime | 31 |

Previous prime | 23 |

Octal | (35)_{8} |

Hexadecimal | (1D)_{16} |

Prime gap | 2 |

5th Twin prime (the small number) | The big number is 19 . |

4th Prime of the Form 4n+1 | 2^{2} + 5^{2} |

4th primorial prime | 5*3*2 - 1 |

6th Sophie Germain prime | |

6th Right-truncatable prime |