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# 9

Number 9 (nine) is an odd digit composite number and natural number following 8 and preceding 10.

## Properties of the number 9

 Nominal 9 Cardinal nine Ordinal 9th Number of digits 1 Sum of digits 9 Product of digits 9 Number parity Odd
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## Prime Factorization of 9

 Prime factorization 3 x 3 Prime factorization in exponent form 32 Prime factors 3 Number of distinct prime factors ω(n) 1 Total number of prime factors Ω(n) 2 Sum of prime factors 3 Product of prime factors 3
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## Divisors of 9

 List of proper divisors 1, 3 List of all dividers 1, 3, 9 Number of divisors d(n) 3 Sum of all divisors σ(n) 13 Aliquot sum 4 9 is a deficient number , since it is larger than the sum of its proper divisors (4). Its deficiency is 5.
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## Prime numbers

 Is 9 a prime number? No Is 9 a semiprime number? Yes Is 9 a Chen prime number? No Is 9 a Mersenne prime number? No
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## Sequences

 Is 9 a Catalan number? No Is 9 a Fibonacci number? No Is 9 a Idoneal number? Yes: I8
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## Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
 9 is not a Happy number 9 is a Humble number 9 is not a Münchhausen number 9 is not a Perfect number 9 is a Perfect square 9 is a Palindrome
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## Numeric Bases of 9

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary10012
3Ternary1003
4Quaternary214
5Quinary145
6Senary136
7Septenary127
8Octal118
9Nonary109
10Decimal9
12Duodecimal912
20Vigesimal920
36Base36936
60Sexagesimal960
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## Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
 Square of 9 (n2) 81 Cube of 9 (n3) 729 Square root of 9 3 Natural Logarithm (ln) of 9 2.19722 Decimal Logarithm (log) of 9 0.954243
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 9 0.412118 Cosecant of 9 2.42649 Cosine of 9 -0.91113 Secant of 9 -1.09754 Tangent of 9 -0.452316 Cotangent of 9 -2.21085
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## Number parity

Parity is the property of an integer of whether it is even or odd.

No

### Is 9 an Odd Number?

Yes, the number 9 is an odd number.
Total number of all odd numbers from 1 to 9 is 5
Sum of all the odd numbers from 1 to 9 are 25
The sum of all odd numbers is a perfect square: 25 = 5
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.
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## Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
 The spelling of 9 in words is "nine", meaning that: 9 is an aban number (a number without the letter a) 9 is not an eban number (as it contains the letter e) 9 is not an iban number (as it contains the letter i) 9 is an oban number (a number without the letter o) 9 is a tban number (a number without the letter t) 9 is an uban number (a number without the letter u)
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## Numeral systems

How to write 9 in other number systems?
 Bengali numerals ৯ Eastern Arabic numerals ٩ Hieroglyphs numeralsused in Ancient Egypt 𓐂 Khmer numerals ៩ Japanese numerals 九 Roman numerals IX Thai numerals ๙
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## Translation

How do you say 9 in 38 different languages?
 Arabic تسعة Croatian devet Czech devět Danish ni Dutch negen Estonian asieke Faroese níggju Filipino siyám Finnish yhdeksän French neuf Greek εννέα German neun Hebrew תשע Hindi नौ Hungarian kilenc Icelandic níu Indonesian sembilan Italian nove Japanese 九 Korean 구 Latvian deviņi Lithuanian devyni Norwegian ni Persian نه Polish dziewięć Portuguese nove Romanian nouă Russian девять Serbian девет Slovak deväť Slovene devet Spanish nueve Swahili tisa Swedish nio Thai เก้า Turkish dokuz Ukrainian девʼять Vietnamese chín
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## Miscellaneous

 Number 9 reversed 9 ASCII Code 9 Unicode Character U+0009 Unix Timestamp Thu, 01 Jan 1970 00:00:09 +0000
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