The composite cofactor of F1229 was the product of 79-digit, 82-digit, and 82-digit prime numbers:

79-digit prime factor:
8991997908750389729495371748334827016279592185702450693170898362822730720281837

82-digit prime factor:
4385400762924901044914540540029706422904607559968290072624713815890052512248218497

82-digit prime factor:
5942695079751847073282975361615691230004846092112758163362098437471343137931552401

Thanks to Carlos Pinho from SETI.USA team for performing the postprocessing. The factors have been reported to the Fibonacci project.