9 (number) - Simple English Wikipedia, the free encyclopedia

← 8 9 10 →
-1 0 1 2 3 4 5 6 7 8 9
Cardinalnine
Ordinal9th
(ninth)
Numeral systemnonary
Factorization32
Greek numeralΘ´
Roman numeralIX
Unicode symbol(s)Ⅸ, ⅸ
Greek prefixennea-
Latin prefixnona-
Binary10012
Ternary1003
Quaternary214
Quinary145
Senary136
Octal118
Duodecimal912
Hexadecimal916
Vigesimal920
Base 36936
Amharic
Arabicl٩
Urdu
Armenian numeralԹ
Bengali
Chinese/Japanese
/Korean numeral
九 (jiu)
玖 (formal writing)
Devanāgarī (Nao)
Greek numeralθ´
Hebrew numeralט (Tet)
Tamil numeral
Khmer
Telugu numeral
Thai numeral
Pronunciation of the number 9

9 (nine) is the Arabic number which comes after 8 and before 10. It is an odd number, and is the highest single-digit number. It is also a square number. In Roman numerals, nine can be written as IX.

The number also looks like an inverted 6. To tell the difference between the two, they are often underlined.

Mathematics

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The number nine (9) takes the shape of an upside-down six (6), is a multiple of 3, and the third square number after 4.

Nine is also a composite number, having the factors: 1, 3 and 9 itself. Nine is the first odd composite number