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_231623_3 ( sex_ratio INTEGER, population VARCHAR )

### Question ###
Name the sex ratio lowest for population 4773138

### Accurate SQL ###

SELECT MAX(sex_ratio) FROM table_231623_3 WHERE population = 4773138