Did his schooling from Sainik School, Thiruvananthapuram and Bharathiya Vidya Bhavan School, Thiruvananthapuram. He also pursued his Bachelor's degree in Engineering/IT from the University of Tasmania, Australia.
Was asked to wear a beard in films because directors felt that it would make him look older.
Son of late actor Sukumaran and actress Mallika Sukumaran, brother of Indrajith, and brother-in-law of actress Poornima Mohan
Director Fazil persuaded him to act in films; it was Fazil who showed the results of his screen test to Renjith, who directed him in 'Nandanam'.
While vacationing in Trivandrum, he was grabbed by director Renjith to act in Nandanam (2002). He was then flooded with other tempting film offers that Prithviraj, then in his second year in Engineering, decided to take a break from studies to concentrate on acting.