The positive integer factors of 1291 are:
1, 1291
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I would say that 1757051 would be difficult to factor, except you did it just fine. Since 1291 and 1361 are both prime, they are the only proper factors. The process of factorization is the same for big numbers as small numbers. Use a factor tree to find the prime factorization. Once you have that, you can find the number of factors and have a pretty good idea of where to look for them. For people desiring a short cut, there are many fine factor calculators online.
factors: 1, 3, 53, 159prime factors: 3, 53
factors: 1, 5, 103, 515prime factors: 5, 1031x5155x103
factors: 1, 2, 251, 502prime factors: 2, 251
factors: 1, 13, 37, 481prime factors: 13, 37