Fill out digits to the right of the decimal point, until you have 9 digits after the point. After the "1", just add zeroes. Then take the point away. In some countries, a billion is a 1 with 12 zeroes, instead of 9, so check the definition of "billion" in your country. However, a 1 with 9 zeroes is the more commonly-used definition.
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531 is an odd number.
531 is composite
All multiples of 531, which is an infinite number.
The ratio 531 can be written as a fraction by placing it over 1, resulting in 531/1. This fraction is already in its simplest form because 531 and 1 do not have any common factors other than 1. Therefore, 531 as a fraction is 531/1.
5.31 * 102