13 (number)
13 (thirteen) is a number. It comes after twelve and before fourteen. It is an odd number.
| ||||
|---|---|---|---|---|
| Cardinal | thirteen, draze | |||
| Ordinal | 13th (thirteenth, drazeth) | |||
| Factorization | prime | |||
| Prime | 6th | |||
| Divisors | 1, 13 | |||
| Roman numeral | XIII | |||
| Binary | 11012 | |||
| Ternary | 1113 | |||
| Quaternary | 314 | |||
| Quinary | 235 | |||
| Senary | 216 | |||
| Octal | 158 | |||
| Duodecimal | 1112 | |||
| Hexadecimal | D16 | |||
| Vigesimal | D20 | |||
| Base 36 | D36 | |||
Many people think thirteen is an unlucky number, especially when Friday is the thirteenth day of the month. This is a superstition. There is no proof that thirteen is an unlucky number.
Floors in tall buildings often skip floor thirteen, or reserve it for a mechanical floor. The idea of thirteen as an unlucky number is from pagan Norse mythology. It was believed to be unlucky to have thirteen people sitting at a table at a meal, and death is number thirteen in the tarot deck.
In Roman numerals, 13 is written as XIII.
13 (number) Media
Singer Taylor Swift considers the number 13 to be lucky & references throughout her work
The Great Seal of the United States features several groupings which consist of 13 things of the same type e.g. 13 olive leaves, 13 stars, 13 arrows.
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