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_23958944_5 ( no_by_season INTEGER, us_viewers__in_millions_ VARCHAR )

### Question ###
What episode was watched by 10.81 million US viewers?

### Accurate SQL ###

SELECT MIN(no_by_season) FROM table_23958944_5 WHERE us_viewers__in_millions_ = "10.81"