1) As I see it, numbers are hardwired into our consciousness, like space, time, and causality. They don't exist "out there"; they're filters that structure how we experience what's "out there," and so we project them onto everything we encounter. I've often thought that it's quite possible that alien beings that lack a rigid structure with, say, a fixed number of fingers, like the shoggoths in my tentacle stories, would find numbers completely baffling.

2) Kundalini puts enormous strain on the psyche, and so any inherent weakness may get triggered. If somebody has a tendency to egomania, for example, a badly handled kundalini experience can inflate their ego to gargantual size, and so on.

3) As I learned it, learning languages in adulthood is 9th house, along with all other post-childhood education. So you'd check the 9th in any case.