CREATE TABLE table_2777 ("Rank" FLOAT, "District" TEXT, "Population" FLOAT, "Growth rate" TEXT, "Sex ratio" FLOAT, "Literacy" TEXT, "Density per Kilometer" FLOAT)

Name the sex ratio lowest for population 4773138
SELECT MAX("Sex ratio") FROM table_2777 WHERE "Population" = '4773138'
SELECT MAX("Sex ratio") FROM "table_2777" WHERE "Population" = '4773138'