Note: This doesn't seem to be a problem in current versions of Matlab and Octave.
Verify proper 64-bit representation in your Matlab / Octave install by:
64-bit integer issues on old Matlab/Octave
int2str() may not work correctly on very old versions of 32-bit Matlab/Octave when using 64-bit integers on all platforms.
If you have this problem, to ensure your 64-bit integer converts to string correctly, use:
in place of: