Bill Clinton's debut novel, The President is Missing, is a million seller

Bill Clinton is a now a million-selling novelist.

"The President is Missing," a thriller co-written with James Patterson, has more than 1 million sales in North America alone.

The book's co-publishers, Alfred A. Knopf and Little Brown and Co., announced the sales figures Wednesday. The novel was released on June 4 and has topped best-seller lists for weeks.

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Reviews were mixed, but Barnes & Noble fiction buyer Sessalee Hensley said in a statement that "The President is Missing" had benefited from "very strong" word of mouth. The book's subject has also proved timely: a potentially devastating cyber attack, which intelligence experts have called a leading concern.

Clinton, whose previous books include the memoir "My Life," is now the rare author to have a million sellers in fiction and nonfiction.