I used to have a similar experience with a different number. I seemed to see it all the time, on clocks, license plates, you name it. I came to the conclusion that I had an expectation to see it, and I just wasn't noticing that other numbers showed up around me, too, because I wasn't looking for those numbers! I only noticed the one I was focusing on. It didn't mean anything in particular other than that I saw what I expected to see.