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Number 99 (ninety-nine) is an odd two-digits composite number and natural number following 98 and preceding 100.

Properties of the number 99

Number of digits2
Sum of digits18
Product of digits81
Number parityOdd
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Prime Factorization of 99

Prime factorization3 x 3 x 11
Prime factorization in exponent form32 x 11
Prime factors3, 11
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)3
Sum of prime factors14
Product of prime factors33
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Divisors of 99

List of proper divisors 1, 3, 9, 11, 33
List of all dividers1, 3, 9, 11, 33, 99
Number of divisors d(n)6
Sum of all divisors σ(n)156
Aliquot sum 57
99 is a deficient number , since it is larger than the sum of its proper divisors (57). Its deficiency is 42.
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Prime numbers

Is 99 a prime number?No
Is 99 a semiprime number?No
Is 99 a Chen prime number?No
Is 99 a Mersenne prime number?No
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Is 99 a Catalan number?No
Is 99 a Fibonacci number?No
Is 99 a Idoneal number?No
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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.
99 is not a Happy number
99 is not a Humble number
99 is not a Münchhausen number
99 is not a Perfect number
99 is not a Perfect square
99 is a Palindrome
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Numeric Bases of 99

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.
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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 99 (n2)9801
Cube of 99 (n3)970299
Square root of 999.9498743710662
Natural Logarithm (ln) of 994.5951198501346
Decimal Logarithm (log) of 991.9956351945975
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Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 99-0.99920683418635
Cosecant of 99-1.000793795425
Cosine of 990.039820880393139
Secant of 9925.112453319146
Tangent of 99-25.092534979677
Cotangent of 99-0.039852490025816
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Number parity

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

Is 99 an Even Number?


Is 99 an Odd Number?

Yes, the number 99 is an odd number.
Total number of all odd numbers from 1 to 99 is 50
Sum of all the odd numbers from 1 to 99 are 2500
The sum of all odd numbers is a perfect square: 2500 = 50
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 99 in words is "ninety-nine", meaning that:
99 is an aban number (a number without the letter a)
99 is not an eban number (as it contains the letter e)
99 is not an iban number (as it contains the letter i)
99 is an oban number (a number without the letter o)
99 is not a tban number (as it contains the letter t)
99 is an uban number (a number without the letter u)
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Numeral systems

How to write 99 in other number systems?
Bengali numerals৯৯
Eastern Arabic numerals٩٩
Hieroglyphs numeralsused in Ancient Egypt𓎎𓐂
Khmer numerals៩៩
Japanese numerals九十九
Roman numeralsXCIX
Thai numerals๙๙
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How do you say 99 in 38 different languages?
Arabicتسعة و تسعون
Croatiandevedeset i devet
Czechdevadesát devět
Danish ni og halvfems
Estonianblaasieke vɔ asieke
Filipinosiyám na pû’t siyám
Greekεννενήντα εννέα
Hebrewתשעים ותשע
Icelandicníutíu og níu
Indonesiansembilan puluh sembilan
Latviandeviņdesmit deviņi
Lithuaniandevyniasdešimt devyni
Persianنود و نه
Polishdziewięćdziesiąt dziewięć
Portuguesenoventa e nove
Romaniannouăzeci şi nouă
Russianдевяносто девять
Serbianдеведесет и девет
Slovenedevetdeset devet
Spanish noventa y nueve
Swahilitisini na tisa
Turkishdoksan dokuz
Ukrainianдевʼяносто девʼять
Vietnamesechín mươi chín
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Number 99 reversed99
ASCII Code99c
Unicode CharacterU+0063c
Unix TimestampThu, 01 Jan 1970 00:01:39 +0000
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