 The population of the Varanasi urban agglomeration in 2001 was 1 @,@ <unk> @,@ <unk> with a ratio of <unk> females every 1 @,@ 000 males . However , the area under Varanasi Nagar Nigam has a population of 1 @,@ 100 @,@ <unk> with a ratio of 883 females for every 1 @,@ 000 males . The literacy rate in the urban agglomeration is 77 % while that in the municipal corporation area is 78 % . Approximately 138 @,@ 000 people in the municipal area live in slums . 
