Andhra Pradesh Chief Minister N. Chandrababu Naidu called on President Pranab Mukherjee here on Wednesday.The chief minister's office described it as a courtesy call. Naidu, on a visit to the national capital, also called on Prime Minister Narendra Modi and various central ministers, seeking special status to the state and assistance to enable Andhra Pradesh -- bifurcated last year in June -- achieve a level-playing field with other states.