President Pratibha Patil, Vice-President Hamid Ansari, Lok Sabha Speaker Somnath Chatterjee and several other leaders greeted Prime Minister Manmohan Singh, who turned 75 on Wednesday.
The leaders sent flowers and greetings to Dr Singh, who is convalescing at 7 Race Course Road after surgery for a prostate gland problem, a spokesman said.
Congress president and UPA chairperson Sonia Gandhi called on Dr Singh.
Russian President Vladimir Putin also called up the prime minister on his birthday.
Dr Singh, born in 1932, does not celebrate his birthdays. The prime minister is slated to release a book later in the day.
