859

859 is a natural number that comes after 858 and before 860. In mathematics, 859 is an odd prime number, meaning its only positive divisors are 1 and itself. The sum of its digits is 22, and its value is not a multiple of 3 or 5.

In various numeral systems, 859 is expressed as 859 in decimal, 0x35B in hexadecimal, 1533 in octal, and 1101011011 in binary. In Roman numerals, it is written as DCCCLIX.

859 is used as an area code in the United States, serving parts of north-central Kentucky, including Lexington. It is also used as a year designation, such as AD 859, in historical contexts.