The composite cofactor of L1809 was the product of 88-digit and 124-digit prime numbers:

88-digit prime factor:
1487186994271174510475673099133551423207473197366754244909915396133380321305955541591729

124-digit prime factor:
3443123784062741671742426030229870167640014996611176236790207442014630633458083125503224315147759748466338732055890529208669

Thanks to Thomas Womack for performing the postprocessing. The factors have been reported to the Fibonacci project.