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Number 45 (forty-five) is an odd two-digits composite number and natural number following 44 and preceding 46.

Properties of the number 45

Number of digits2
Sum of digits9
Product of digits20
Number parityOdd
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Prime Factorization of 45

Prime factorization3 x 3 x 5
Prime factorization in exponent form32 x 5
Prime factors3, 5
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)3
Sum of prime factors8
Product of prime factors15
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Divisors of 45

List of proper divisors 1, 3, 5, 9, 15
List of all dividers1, 3, 5, 9, 15, 45
Number of divisors d(n)6
Sum of all divisors σ(n)78
Aliquot sum 33
45 is a deficient number , since it is larger than the sum of its proper divisors (33). Its deficiency is 12.
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Prime numbers

Is 45 a prime number?No
Is 45 a semiprime number?No
Is 45 a Chen prime number?No
Is 45 a Mersenne prime number?No
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Is 45 a Catalan number?No
Is 45 a Fibonacci number?No
Is 45 a Idoneal number?Yes: I25
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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.
45 is not a Happy number
45 is a Humble number
45 is not a Münchhausen number
45 is not a Perfect number
45 is not a Perfect square
45 is not a Palindrome
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Numeric Bases of 45

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 45 (n2)2025
Cube of 45 (n3)91125
Square root of 456.7082039324994
Natural Logarithm (ln) of 453.8066624897703
Decimal Logarithm (log) of 451.6532125137753
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Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 450.85090352453412
Cosecant of 451.1752213631357
Cosine of 450.52532198881773
Secant of 451.9035944074044
Tangent of 451.6197751905439
Cotangent of 450.61736962378356
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Number parity

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

Is 45 an Even Number?


Is 45 an Odd Number?

Yes, the number 45 is an odd number.
Total number of all odd numbers from 1 to 45 is 23
Sum of all the odd numbers from 1 to 45 are 529
The sum of all odd numbers is a perfect square: 529 = 23
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 45 in words is "forty-five", meaning that:
45 is an aban number (a number without the letter a)
45 is not an eban number (as it contains the letter e)
45 is not an iban number (as it contains the letter i)
45 is not an oban number (as it contains the letter o)
45 is not a tban number (as it contains the letter t)
45 is an uban number (a number without the letter u)
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Numeral systems

How to write 45 in other number systems?
Bengali numerals৪৫
Eastern Arabic numerals٤٥
Hieroglyphs numeralsused in Ancient Egypt𓎉𓏾
Khmer numerals៤៥
Japanese numerals四十五
Roman numeralsXLV
Thai numerals๔๕
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How do you say 45 in 38 different languages?
Arabicخمسة و أربعون
Croatiančetrdeset i pet
Czechčtyřicet pět
Danish fem og fyrre
Estonianblaene vɔ atɔ̃
Filipinoápat na pû’t limá
Greekσαράντα πέντε
Hebrewארבעים וחמש
Icelandicfjörutíu og fimm
Indonesianempat puluh lima
Latviančetrdesmit pieci
Lithuanianketuriasdešimt penki
Persianچهل و پنج
Polishczterdzieści pięć
Portuguesequarenta e cinco
Romanianpatruzeci şi cinci
Russianсорок пять
Serbianчетрдесет и пет
Sloveneštirideset pet
Spanish cuarenta y cinco
Swahiliarobaini na tano
Turkishkırk beş
Ukrainianсорок пʼять
Vietnamesebốn mươi lăm
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Number 45 reversed54
ASCII Code45-
Unicode CharacterU+002D-
Unix TimestampThu, 01 Jan 1970 00:00:45 +0000
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