# Everything about 1

Discover a lot of information on the number 1: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Numerology and symbolism of the number 1

The number 1 (one) represents the uniqueness, the unique, a starting point, a beginning.

## Mathematical properties of 1

Questions and answers |

Is 1 a prime number? |
Yes |

Is 1 a perfect number? |
No |

Number of divisors |
1 |

List of dividers |
1 |

Sum of divisors |
1 |

## How to write / spell 1 in letters?

In letters, the number 1 is written as: One. And in other languages? how does it spell?

1 in other languages |

Write 1 in english |
One |

Write 1 in french |
Un |

Write 1 in spanish |
Uno |

Write 1 in portuguese |
Um |

## Mathematical representations and links

Other ways to write 1 |

In letter |
One |

In roman numeral |
I |

In binary |
1 |

In octal |
1 |

In hexadecimal |
1 |

In US dollars |
USD 1.00 ($) |

In euros |
1,00 EUR (€) |

Some related numbers |

Previous number |
0 |

Next number |
2 |

Next prime number |
2 |

## Mathematical operations

Operations and solutions |

1*2 |
= |
2 |
The double of 1 is 2 |

1*3 |
= |
3 |
The triple of 1 is 3 |

1/2 |
= |
0.5 |
The half of 1 is 0.500000 |

1/3 |
= |
0.33333333333333 |
The third of 1 is 0.333333 |

1^{2} |
= |
1 |
The square of 1 is 1.000000 |

1^{3} |
= |
1 |
The cube of 1 is 1.000000 |

√1 |
= |
1 |
The square root of 1 is 1.000000 |

log(1) |
= |
0 |
The natural (Neperian) logarithm of 1 is 0.000000 |

log10(1) |
= |
0 |
The decimal logarithm (base 10) of 1 is 0.000000 |

sin(1) |
= |
0.8414709848079 |
The sine of 1 is 0.841471 |

cos(1) |
= |
0.54030230586814 |
The cosine of 1 is 0.540302 |

tan(1) |
= |
1.5574077246549 |
The tangent of 1 is 1.557408 |