Pesky Puzzler V

Here’s a two part Puzzler that should be fun.  The answers are related and when you find out how, you’ll have a big clue. (There may be alternate acceptable answers to each part).

A)  What is mathematically special about the Zip Code for Savannah, Georgia?

B)  What would be mathematically special about the St. Louis area phone number 314-159-2653? (Such a phone number likely is not allowed due to the leading ‘1’ in the 7-digit number.)