Published Sunday, 16 December 2012
James Arthur is crowned X Factor winner (© Rex Features)
The track also became the fastest selling single of the year so far, with 490,000 copies, according to the Official Chart Company.
The sales also made it the fastest-selling X Factor winner's single since Alexandra Burke's 2008 hit Hallelujah.
Speaking to OfficialCharts.com, James said: "To everyone from home and around Britain who bought the single, thank you very, very much. You've made my dreams come true."
"The fact that it was in aid of Together For Short Lives, which is a great cause and a great charity, I think that really helped.
"My Number 1 Award is going to go on my mantelpiece and I'll probably kiss it for two weeks solid every time I pass it!"
James will hope the single can hold on to the top spot for a second week and become Christmas number one next Sunday.
A cover version of the Hollies' hit He Ain't Heavy, He's My Brother by The Justice Collective - including Sir Paul McCartney and Robbie Williams - supporting the families of Liverpool supporters killed in the 1989 Hillsborough disaster, is favourite to be the festive chart-topper.
The original version of Impossible, by Bajan singer Shontelle re-entered the chart at 22 on Sunday, having originally reached number nine in 2010.
The Voice judge Will.i.am was another new entry at two with Scream & Shout, featuring Britney Spears.
Meanwhile runner-up Jahmene Douglas has landed his first job since the end of the show.
The former Asda shelf stacker has recorded a version of Silent Night for a special online advert for the supermarket chain.
He said he recorded the track as a "way of saying thank-you" to everyone who voted for him throughout the show.
The singer said: "It was an amazing feeling to record my first song in the studio that wasn't for the show. I feel blessed to have had this opportunity and can't wait to see what the future holds."
© UTV News