9 (number)
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.
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Cardinal | nine | |||
Ordinal | 9th (ninth) | |||
Factorization | 32 | |||
Roman numeral | IX | |||
Unicode symbol(s) | Ⅸ, ⅸ | |||
Greek prefix | ennea- | |||
Latin prefix | nona- | |||
Binary | 10012 | |||
Ternary | 1003 | |||
Quaternary | 214 | |||
Quinary | 145 | |||
Senary | 136 | |||
Octal | 118 | |||
Duodecimal | 912 | |||
Hexadecimal | 916 | |||
Vigesimal | 920 | |||
Base 36 | 936 | |||
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 |
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The number also looks like an inverted 6. To tell the difference between the two, they are often underlined.
Mathematics
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
9 (number) Media
Non-intersecting chords between four points on a circle
Four concentric magic circles with 9 in the center (by Yang Hui), where numbers on each circle and diameter around the center generate a magic sum of 138.
Playing cards showing the 9 of all four suits