Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_24027047_1 (administrative_division VARCHAR, population_density___km²_2011_ VARCHAR)

### Question ###
In what division was there a population density in km2 of 4,491.8 in 2011? 

### Accurate SQL ###

SELECT administrative_division FROM table_24027047_1 WHERE population_density___km²_2011_ = "4,491.8"