A man has won an original Pablo Picasso painting worth more than €1m (£870,000; $1.2m) in a charity raffle.

Ari Hodara, an engineer and art enthusiast, learned he was the winner on Tuesday when he answered a video call from Christie’s auction house in Paris.

“How do I know this isn’t a prank?” the 58-year-old asked when he was told he was the new owner of the 1941 work by the Spanish master.

Organisers said more than 120,000 tickets for the prize draw were sold at €100 (£87; $118) each, raising around €11m (£10m; $13m) for Alzheimer’s research.

The draw was the third edition of the “1 Picasso for 100 euros” fundraising raffle, which was founded in 2013.

This year’s prize was Tête de Femme (Head of a Woman), a gouache-on-paper portrait rendered in Picasso’s signature style. It depicts his partner and muse, the French surrealist artist Dora Maar.

“I was surprised, that’s it,” said Hodara during a phone call with auctioneers after the draw. “When you bet on this, you don’t expect to win… But I’m very happy because I’m very interested in painting, and it’s great news for me.”

Hodara’s ticket was number 94,715. He said he bought it over the weekend after learning about the competition by chance.