CREATE TABLE table_24550 ("District" TEXT, "Headquarters" TEXT, "Area  ( km\\u00b2 ) " FLOAT, "Population  ( 2011 ) " FLOAT, "Division" TEXT)

If the 2011 population is 3685681, what is the name of the headquarters?
SELECT "Headquarters" FROM table_24550 WHERE "Population (2011)" = '3685681'
SELECT "Headquarters" FROM "table_24550" WHERE "Population (2011)" = '3685681'