natural number From Wikipedia, the free encyclopedia
9 (nine) is the Arabic number which comes after 8 and before 10. It is an odd number, and is the highest singledigit number. It is also a square number. In Roman numerals, nine can be written as IX.
 

Cardinal  nine  
Ordinal  9th (ninth)  
Numeral system  nonary  
Factorization  3^{2}  
Greek numeral  Θ´  
Roman numeral  IX  
Unicode symbol(s)  Ⅸ, ⅸ  
Greek prefix  ennea  
Latin prefix  nona  
Binary  1001_{2}  
Ternary  100_{3}  
Quaternary  21_{4}  
Quinary  14_{5}  
Senary  13_{6}  
Octal  11_{8}  
Duodecimal  9_{12}  
Hexadecimal  9_{16}  
Vigesimal  9_{20}  
Base 36  9_{36}  
Amharic  ፱  
Arabicl  ٩  
Urdu  
Armenian numeral  Թ  
Bengali  ৯  
Chinese/Japanese /Korean numeral  九 (jiu) 玖 (formal writing)  
Devanāgarī  ९ (Nao)  
Greek numeral  θ´  
Hebrew numeral  ט (Tet)  
Tamil numeral  ௯  
Khmer  ៩  
Telugu numeral  ౯  
Thai numeral  ๙ 
This article may be expanded with text translated from the corresponding article in English. Click [show] for important translation instructions.

The number also looks like an inverted 6. To tell the difference between the two, they are often underlined.
The number nine (9) takes the shape of an upsidedown 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
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.