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1

Number 1 (one) is an odd digit prime number and natural number following 0 and preceding 2.

Properties of the number 1

 Nominal 1 Cardinal one Ordinal 1st Number of digits 1 Sum of digits 1 Product of digits 1 Number parity Odd
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Prime Factorization of 1

 Prime factorization Prime factors Number of distinct prime factors ω(n) 0 Total number of prime factors Ω(n) 0 Sum of prime factors 0 Product of prime factors 1
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Divisors of 1

 List of proper divisors 1 List of all dividers 1, 1 Number of divisors d(n) 2 Sum of all divisors σ(n) 2 Aliquot sum 1 1 is a perfect number, since it is equal to the sum of its proper divisors.
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Prime numbers

 Is 1 a prime number? Yes Is 1 a semiprime number? No Is 1 a Chen prime number? No Is 1 a Mersenne prime number? No
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Sequences

 Is 1 a Catalan number? Yes: C0, C1 Is 1 a Fibonacci number? Yes Is 1 a Idoneal number? Yes: I0
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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.
 1 is a Happy number 1 is a Humble number 1 is a Münchhausen number 1 is not a Perfect number 1 is a Perfect square 1 is a Palindrome
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Numeric Bases of 1

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
2Binary12
3Ternary13
4Quaternary14
5Quinary15
6Senary16
7Septenary17
8Octal18
9Nonary19
10Decimal1
12Duodecimal112
20Vigesimal120
36Base36136
60Sexagesimal160
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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 1 (n2) 1 Cube of 1 (n3) 1 Square root of 1 1 Natural Logarithm (ln) of 1 0 Decimal Logarithm (log) of 1 0
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Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 1 0.841471 Cosecant of 1 1.1884 Cosine of 1 0.540302 Secant of 1 1.85082 Tangent of 1 1.55741 Cotangent of 1 0.642093
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Number parity

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

No

Is 1 an Odd Number?

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

How to write 1 in other number systems?
 Bengali numerals ১ Eastern Arabic numerals ١ Hieroglyphs numeralsused in Ancient Egypt 𓏺 Khmer numerals ១ Japanese numerals 一 Roman numerals I Thai numerals ๑
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Translation

How do you say 1 in 38 different languages?
 Arabic واحد Croatian jedan Czech jeden Danish en Dutch één Estonian ɖeka Faroese ein Filipino isá Finnish yksi French un Greek ένα German eins Hebrew אחת Hindi एक Hungarian egy Icelandic einn Indonesian satu Italian uno Japanese 一 Korean 일 Latvian viens Lithuanian vienas Norwegian én Persian یک Polish jeden Portuguese um Romanian unu Russian один Serbian један Slovak jeden Slovene ena Spanish uno Swahili moja Swedish en Thai หนึ่ง Turkish bir Ukrainian один Vietnamese một
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Miscellaneous

 Number 1 reversed 1 ASCII Code 1  Unicode Character U+0001  Unix Timestamp Thu, 01 Jan 1970 00:00:01 +0000
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