Table schema:
CREATE TABLE table_2501754_4 (episode__number INTEGER, viewing_figures_millions VARCHAR, prod_code VARCHAR)

Question: What is the lowest episode number with 6.19 million viewers and a production code of icec487y?
SQL: SELECT MIN(episode__number) FROM table_2501754_4 WHERE viewing_figures_millions = "6.19" AND prod_code = "ICEC487Y"