Hackers start with a list of known passwords, because people are, on the whole, unoriginal. As you have just demonstrated.
It looks like it might be a telephone number or a date. If it is, and it has any meaning to you, then people who know you (or know about you) might find it easy to guess.
Medium length passwords should always contain non-alphanumeric characters. Letters and numbers alone aren't enough.
Crypt (self-salted): 19ueT45egRI5Y