select * from pg_class where relfilenode = 5214489;
and show the result.
Do not delete the pg_statistic table. I would not even delete from it. /Sorry, I already deleted it. I looked for something official and found in the site in postgres the reference that the delete could be done (https://www.postgresql.org/docs/9.1/static/release-7-4-2.html) and I ended up doing it. Now I'm running a vacuum analyze across the base./