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Are shortened URI to StackExchange questions stable?

URI to questions on StackExchange may be shortened from:

http://stackoverflow.com/questions/123456789/my-popular-question

to:

http://stackoverflow.com/questions/123456789

Suppose you've been keeping notes locally about your findings on StackExchange communities in plain-text files, and that a great number of those plain-text files contain shortended URI to questions on StackExchange communities.

My question is: is it safe to write down the shortened URI? Or rather, is the shortended URI stable?

The URI provided by the share button is somewhat different from what I'm calling a shortened URI.