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13th

← 12 13 14 →
Cardinal thirteen
Ordinal 13th
(thirteenth)
Numeral system tredecimal
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

13 (thirteen /θɜːrˈtn/) is the natural number following 12 and preceding 14.

In spoken English, the numbers 13 and 30 are often confused. When carefully pronounced, they differ in which syllable is stressed: 13 Listeni/θɜːrˈtn/ vs. 30 /ˈθɜːrti/. However, in dates such as 1300 ("thirteen hundred") or when contrasting numbers in the teens, such as 13, 14, 15, the stress shifts to the first syllable: 13 /ˈθɜːrtn/. In a 24-hour clock, the thirteenth hour is in conventional language called one o'clock.


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