Gordon Brown has said he is not a "misery" and likes to "laugh and joke" as much as other people.
Mr Brown says he is not so serious with friends
He told BBC Radio 4's Today programme he had to appear "serious and prudent" in his role as chancellor.
Mr Brown made the comments while being interviewed by John Humphrys, who has reportedly called Mr Brown his "most boring political interviewee".
The chancellor said people "who know me privately... know that I am as able to laugh and joke as everybody else".
In an after-dinner speech in June, Mr Humphrys reportedly mocked senior politicians, including Mr Brown, Prime Minister Tony Blair and Deputy Prime Minister John Prescott.
A BBC inquiry said his remarks had been "inappropriate and misguided".
Asked on Monday's Today programme by Mr Humphrys whether he was "user friendly" enough to become prime minister, Mr Brown said: "This is an issue about being chancellor.
"You've got to show that you are serious and prudent in the things you do and I think it is right because that is the way I want to manage the economy.
"But I also think people know me privately and they know that I am as able to laugh and joke as everybody else."
He added: "Perhaps, John, you haven't seen me in private. But that's because I don't attend your after-dinner speeches."
After reports of his after-dinner speech, made to the Communication Directors' Forum, Mr Humphrys said: "Everything I said was meant with great affection for politicians. It was a good humoured, light-hearted speech."