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_15977 ( "#" real, "City" text, "1981 Census" real, "1991 Census" real, "2001 Census" real, "2010 Est." real, "Region" text )

### Question ###
How many 2001 censuses are there on number 13?

### Accurate SQL ###

SELECT COUNT("2001 Census") FROM table_15977 WHERE "#" = '13'