Next prime | 5 |

Previous prime | 2 |

Octal | (3)_{8} |

Hexadecimal | (3)_{16} |

Prime gap | 2 |

1st Twin prime (the small number) | The big number is 5 . |

1st Cousin prime (the small number) | The big number is 7 . |

1st Prime of the Form 4n+3 | |

1st Mersenne prime | 2^{2} - 1 |

1st Fermat prime | 2^{20} + 1 |

1st Euclid prime | 2 + 1 |

1st primorial prime | 2 + 1 |

2nd Factorial prime | 2! + 1 |

2nd Double factorial prime | 2!! + 1 |

2nd Sophie Germain prime | |

2nd Left-truncatable prime | |

2nd Right-truncatable prime | |

2nd Two-sided prime |