19 (nineteen) is a positive integer following 18 and preceding 20. Its ordinal form is written "19th" or "ninteenth".

Properties Edit

19 is an odd prime number.

In googology Edit

In Greek-based number-naming systems, 19 is associated with prefix "enneadeka-", and with prefix "novemdeci-" in Latin systems.

Its Roman numeral (XIX) is used in Fibonaxix.