what is the episode number where the total viewers is 614000?
CREATE TABLE "table1_12995531_3" (
  "series_number" text,
  "episode_number" real,
  "date_of_first_broadcast" text,
  "total_viewers" real,
  "series_average" real
);
SELECT MIN("episode_number") FROM "table1_12995531_3" WHERE "total_viewers"=614000;