Published Monday, 10 December 2012
X Factor winner James Arthur with his mentor Nicole Scherzinger. (© Rex Features)
James's first single, a cover of Shontelle's Impossible, is already number one in the iTunes chart.
"It is starting to sink in - I was overwhelmed," the 24-year-old told ITV's Daybreak on Monday.
"That's why my reaction was so still. I couldn't believe it. I actually thought Dermot said Jahmene."
But James, who was previously more used to playing in pubs in his native Saltburn than sold-out arenas, isn't getting carried away with his X Factor success.
"I'm just going to work hard and get my album out as quickly as possible and not wait around," he said. "I've got a lot of material so now as soon as I get back into the studio, I'll be ready."
And James remains full of praise for his runner-up Jahmene Douglas, telling Daybreak that the shy former supermarket worker is "world-class".
He added: "That guy is going to do phenomenally well off the back of this competition because he has had a chance to showcase just how amazing he is."
While James hasn't yet heard from X Factor supremo Simon Cowell, he confirmed that he had spotted the congratulatory tweet from him.
He also insists that the X Factor is still hugely popular and that people would miss it if it was gone.
"You know it's funny because I think all the people who say they hate it watch it," James said.
"And I think a lot of people who say they hate it are hypocrites because they all comment on it and people always talk about it - so, whether you love it or hate it, I bet they're sat in front of the telly on Saturday night watching it.
"I think it's still one of the most watched things on TV. Everybody talks about it."
He added that he felt this year's show was the "best ever" because some acts were keeping it real.
"I think this year those people who hated it were converted a little bit by the likes of Lucy and Ella and hopefully myself, because we write our own stuff and play our own instruments and we haven't compromised ourselves and dressed up in pink leotards," James said.
"I think this year has been the best year ever because the X Factor have encouraged real, genuine singer-songwriters who play their own instruments, who write their own songs, to come and audition. And I'm not exactly Justin Bieber and I've just won the X Factor, so what does that say?"