Discover a lot of information on the number 9: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Numerology and symbolism of the number 9

The number 9 (nine) represents humanity, altruism. It symbolizes generosity, idealism and humanitarian vocations.

## Mathematical properties of 9

Questions and answers |

Is 9 a prime number? |
No |

Is 9 a perfect number? |
No |

Number of divisors |
3 |

List of dividers |
1, 3, 9 |

Sum of divisors |
13 |

Prime factorization |
3^{2} |

Prime factors |
3 |

## How to write / spell 9 in letters?

In letters, the number 9 is written as: Nine. And in other languages? how does it spell?

9 in other languages |

Write 9 in english |
Nine |

Write 9 in french |
Neuf |

Write 9 in spanish |
Nueve |

Write 9 in portuguese |
Nove |

## Mathematical representations and links

Other ways to write 9 |

In letter |
Nine |

In roman numeral |
IX |

In binary |
1001 |

In octal |
11 |

In hexadecimal |
9 |

In US dollars |
USD 9.00 ($) |

In euros |
9,00 EUR (€) |

Some related numbers |

Previous number |
8 |

Next number |
10 |

Next prime number |
11 |

## Mathematical operations

Operations and solutions |

9*2 |
= |
18 |
The double of 9 is 18 |

9*3 |
= |
27 |
The triple of 9 is 27 |

9/2 |
= |
4.5 |
The half of 9 is 4.500000 |

9/3 |
= |
3 |
The third of 9 is 3.000000 |

9^{2} |
= |
81 |
The square of 9 is 81.000000 |

9^{3} |
= |
729 |
The cube of 9 is 729.000000 |

√9 |
= |
3 |
The square root of 9 is 3.000000 |

log(9) |
= |
2.1972245773362 |
The natural (Neperian) logarithm of 9 is 2.197225 |

log10(9) |
= |
0.95424250943932 |
The decimal logarithm (base 10) of 9 is 0.954243 |

sin(9) |
= |
0.41211848524176 |
The sine of 9 is 0.412118 |

cos(9) |
= |
-0.91113026188468 |
The cosine of 9 is -0.911130 |

tan(9) |
= |
-0.45231565944181 |
The tangent of 9 is -0.452316 |