What's the smallest area in Russia that is ranked 23 with a population more than 522,800?
CREATE TABLE "list_of_the_50_largest_country_subdivisi" (
  "rank" real,
  "subdivision_name" text,
  "country" text,
  "area_km" real,
  "population" real
);
SELECT MIN("area_km") FROM "list_of_the_50_largest_country_subdivisi" WHERE "country"='russia' AND "rank"=23 AND "population">'522,800';