The Number 2009: Properties and MeaningsPrime Factors of 2009=7x7x41.
2009 can be expressed as the sum of 4 positive cubes in exactly 3 ways.
Both 2009 and its reversal 9002 are multiples of 7.
The 2009th prime (17471) is palindromic.
The Year 2009 ADThe year 2009 AD is The International Year of Astronomy (IYA2009) a year-long celebration of astronomy, coinciding with the 400th anniversary of the first recorded astronomical observations with a telescope by Galileo Galilei and the publication of Johannes Kepler's Astronomia nova.
The United Nations General Assembly declared 2009 as the International Year of Natural Fibres.