2147483647 (231-1), Mersenne prime is the maximum possible value for 32-bit integer that is the largest integer that can be written in 32 bits.
What does this have to do with the phone numbers? Ironically, it has the most direct relation. It turns out that a significant number of American programmers are developing the systems in order to optimize it, where numbers are stored on the server in the form of 32-bit integers. Thus, the maximum possible number is equal to (214) 748-3647 in the United States, where 214 is a code of Dallas. When we enter into the database greater value then it is stored the maximum possible number of 2147483647.
If we conduct a search on the Internet, we can find hundreds of the phone books from all over America, which refer to the same number in Dallas. We can only sympathize to the owner of this phone number.
How could not the project’s clients to notice the mistake on the part of developers? Probably many of them did the business in the region, where the code is less than 214, so that the other phone numbers just did not get into the database. Maybe the developers convinced someone that this is the best way to optimize: in such form the numbers take up less space than when are stored in the form of individual characters. In fact many are obsessed with the optimization. The lessons of Y2K did not go well for all; moreover, a new generation of programmers grew up who do not remember Y2K at all.
Today I would like to represent our small project named "UMumble" to You, and I suppose I will start from the beginning.
How did this idea start up?
One evening, surfing the Internet I came across an interesting project that combined a news portal with interestingly organized IT community. But why was it interesting to me?
At first sight, it was a common IT community voting for certain news items, thereby digging them up to the top (in seems to me that I have already seen it, for sure at digg.com). But getting deeper into it I noticed that its articles were quite professional although there was no editor at the resource. The articles were written by the community itself, and the community voted for them using special rating system. One could vote for anything including the users (thereby raising their positions at the rating table or banning them to write at the resource), topics, questions, comments etc. And such collective actions of the community prohibited (allowed for) certain activities .It was a sort of a role game. Considering that the resource was not English but quite, I discussed it and consulted with my colleagues and a decision to create a similar project was made. That's how "UMumble" appeared.