Arab League Russia Population 407,251,880 (2018) 146,793,744 (2018) Area 13,953,041 km² (5,382,910 sq mi) 17,075,400 km² (6,592,800 sq mi) Population density 24.33/km² (63/sq mi) 8.3/km² (21.5/sq mi) Capital Cairo Moscow Largest city Cairo – 19,500,000 (20,439,541 Metro) Moscow – 10,126,424 Organization and type of government Regional organisation and political union Federal semi-presidential republic Official languages Arabic Russian Main religions 91% Islam, 5.8% Christianity, 4% others 73% Russian Orthodoxy, 13% Agnostic, 14% Islam GDP (nominal) $2.821 trillion ($11,914 per capita) $1.610 trillion ($11,082 per capita)