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_71936 ( "City" text, "Hanzi" text, "Hanyu Pinyin" text, "Regional Population(2010)" text, "GDP(2011)(billion yuan)" real )

### Question ###
Which Hanzi has a Regional Population of 4,591,972 in 2010?

### Accurate SQL ###

SELECT "Hanzi" FROM table_71936 WHERE "Regional Population(2010)" = '4,591,972'