"Number 1" is a song written by Tinchy Stryder, Dappy (N-Dubz) and Fraser T Smith, who is also responsible for the production. It is his third single release in the UK. The song was both digitally and physically released in the United Kingdom on April 20, 2009.

The recording contains a very distinctive strings sample from The Last Time (song) as performed by the Andrew Oldham Orchestra. A longer sample of the same piece also featured in Bittersweet Symphony by The Verve, where it famously resulted in a law suit which eventually saw Mick Jagger and Keith Richards credited as the composers of the Verve track, although they had written none of its lyrics.