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The Number 2009: Properties and Meanings
Prime Factors of
2009=
7x
7x
41.
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 AD
The year
2009 AD is The International Year of Astronomy (IYA
2009) 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.