I am a mathematician, and ...
... I watched this movie because I had noticed many favorable comments.
While I don't consider it a waste of my time, I found this movie to be mostly boring and bland. It tries to be hard-hitting but misses the mark most of the time. A 216-digit number that gives the name of God, and meaning of life? Come on, that borders on silliness.
I would not recommend it to any of my friends, but I can imagine its audience. The grainy, high-contrast B&W cinematography is quite good, and interesting, and fits the mood of a man seemingly always on the verge of a massive mental break-down. For those who like startlingly "different" movies, gritty, artistic movies for the sake of being different, gritty, and artistic, it is quite well made.
For most fans of good, enjoyable movies, I'd say very few would enjoy this one.
TxMike
Make a choice, to take a chance, to make a difference.