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# 45

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

## Properties of the number 45

 Nominal 45 Cardinal forty-five Ordinal 45th Number of digits 2 Sum of digits 9 Product of digits 20 Number parity Odd
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## Prime Factorization of 45

 Prime factorization 3 x 3 x 5 Prime factorization in exponent form 32 x 5 Prime factors 3, 5 Number of distinct prime factors ω(n) 2 Total number of prime factors Ω(n) 3 Sum of prime factors 8 Product of prime factors 15
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## Divisors of 45

 List of proper divisors 1, 3, 5, 9, 15 List of all dividers 1, 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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## Sequences

 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.
BaseSystemValue
2Binary1011012
3Ternary12003
4Quaternary2314
5Quinary1405
6Senary1136
7Septenary637
8Octal558
9Nonary509
10Decimal45
12Duodecimal3912
20Vigesimal2520
36Base361936
60Sexagesimalj60
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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 45 6.7082 Natural Logarithm (ln) of 45 3.80666 Decimal Logarithm (log) of 45 1.65321
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 45 0.850904 Cosecant of 45 1.17522 Cosine of 45 0.525322 Secant of 45 1.90359 Tangent of 45 1.61978 Cotangent of 45 0.61737
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## Number parity

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

No

### 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 numerals ৪৫ Eastern Arabic numerals ٤٥ Hieroglyphs numeralsused in Ancient Egypt 𓎉𓏾 Khmer numerals ៤៥ Japanese numerals 四十五 Roman numerals XLV Thai numerals ๔๕
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## Translation

How do you say 45 in 38 different languages?
 Arabic خمسة و أربعون Croatian četrdeset i pet Czech čtyřicet pět Danish fem og fyrre Dutch vijfenveertig Estonian blaene vɔ atɔ̃ Faroese fýrati­fimm Filipino ápat na pû’t limá Finnish neljä­kymmentä­viisi French quarante-cinq Greek σαράντα πέντε German fünf­und­vierzig Hebrew ארבעים וחמש Hindi पैंतालीस Hungarian negyven­öt Icelandic fjörutíu og fimm Indonesian empat puluh lima Italian quarantacinque Japanese 四十五 Korean 사십오 Latvian četrdesmit pieci Lithuanian keturiasdešimt penki Norwegian førti­fem Persian چهل و پنج Polish czterdzieści pięć Portuguese quarenta e cinco Romanian patruzeci şi cinci Russian сорок пять Serbian четрдесет и пет Slovak štyridsať­päť Slovene štirideset pet Spanish cuarenta y cinco Swahili arobaini na tano Swedish fyrtiofem Thai สี่​สิบ​ห้า Turkish kırk beş Ukrainian сорок пʼять Vietnamese bốn mươi lăm
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## Miscellaneous

 Number 45 reversed 54 ASCII Code 45 - Unicode Character U+002D - Unix Timestamp Thu, 01 Jan 1970 00:00:45 +0000
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