Katy actually has a #1 in France.
IKAG reached #1 in downloads and the physical chart (charts were not combined back then) was irrelevant, if you were #1 inb dowlnoads with like 15k and that you did not have a physical copy out, you couldn't chart. It means that if you sold 900 physical copies and 1000 downloads, you were #1 on the official chart while someone that sold 15k dowloads and sold 200 physical copies was not #1.