1. That it is a sacred number meaning Death and Rebirth – Please note reincarnation has 13 letters.
2. It also means the Beginning and the End – The Alpha and Omega.
3. It is the true sign of Sacred and Secret Knowledge.
4. The number also means Love, Sacred Sexuality and the Mother Goddess.
5. That it is the number for Completion and Perfection.
6. The true number of God. The universal All Seeing, All Knowing.
7 Yes it is associated with the Devil and bad things, however the Devil and bad things are associated with any ancient and old knowledge. This was how the Christian church portrayed that what they did not like or saw as heretical, due to the truth within it.