Who called from 313146621

I've been getting a call also from this number.  Can somebody please let us know wherether it is a valid number and from which country.

I've got a call from this number several times. Who is this?? It is quite irritating.

I Also received a call from this number,Once a week, and its going on for 4weeks now. when I answer, the call is ended. and I don't hear anything on the other end. who is this? scam of what?

Just stop answering...

Also had 2  calls from this number but when answering, nobody speaks???