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9 (nine) is a positive integer following 8 and preceding 10. Its ordinal form is written "9th" or "ninth".

## Properties

9 is the smallest number that is both odd and composite. It is the 3rd square number.

• 9 is also equal to !4 using subfactorial.
• Its prime factorization is 9 = 3².
• 9 is one of two known odd unitary superperfect numbers. The other one is 165.
• A 9 sided polygon is called an enneagon or a nonagon.

## In googology

• Some googologisms based on 9 are googolnoniplex and superenn.
• 9 can be named "garthree" with the gar- prefix.
• In Greek-based number naming systems, 9 is associated with prefix ennea-, and with prefix nona- or novem- in Latin systems
• Username5243 coined the name Ternary-Goodol for this number, and it's equal to 3[1]2 in Username5243's Array Notation.[1]
• Binary198 calls this number hyper, and it's equal to $$[2,\omega^2]$$ using Ordinal Array Notation.[2]

## Sources

Gar-: garone · gartwo · garthree · garfour · garfive · garsix · garseven · gareight · garnine · garten · garhundred · gargoogol · gartrialogue · gargoogolplex · gargiggol
Fz-: fzone · fztwo · fzthree · fzfour · fzfive · fzsix · fzseven · fzeight · fznine · fzten · fztwenty · fzhundred · fzthousand · fzmillion · fzgoogol · fzmilliplexion · fzgoogolplex · fzgargoogolplex · fzgargantugoogolplex · fzgiggol
Fuga-: fugaone · fugatwo · fugathree · fugafour · fugafive · fugasix · fugaseven · fugaeight · fuganine · fugaten · fugaeleven · fugahundred · fugagoogol · fugagoogolplex · fugagargoogolplex · fugagargantugoogolplex · fugagiggol
Megafuga-: megafugaone · megafugatwo · megafugathree · megafugafour · megafugafive · megafugasix · megafugaseven · megafugaeight · megafuganine · megafugaten · megafugaeleven · megafugatwelve · megafugathirteen · megafugafourteen · megafugafifteen · megafugasixteen · megafugaseventeen · megafugaeighteen · megafuganineteen · megafugatwenty · megafugathirty · megafugaforty · megafugafifty · megafugasixty · megafugaseventy · megafugaeighty · megafuganinety · megafugahundred · megafugagoogol · megafugagoogolplex · megafugagargoogolplex · megafugagargantugoogolplex
Booga-: boogaone · boogatwo · boogathree · boogafour · boogafive · boogasix · boogaten boogahundred · boogagoogol · boogagoogolplex
Gag: gagone · gagtwo · gagthree · gagfour · gagfive · gagsix · gagseven · gageight · gagnine · gagten · gaggoogol · gaggoogolplex