Factor Info
| ID | 1991 |
| Size | 181 digits / 601 bits |
| Status | composite |
| Value | 4675864670420777738523799943848105615064069484744861535179015849535500147074827480620560286539804790203907433243588230542073887387463485840887304896658890967266718088262143266065181 |
Factorizations
| Primary | (ID: 10101) 27268565128918438900818197910377197199 (proven prime) |
| (ID: 10102) 171474540310960539742349716246441776408111633654209021505505680451791159342452854804027892933885109876518004368989485120868998797881240056201619 (composite) |
Primary factorization keeps track of the smallest (known) prime factor. Secondary factorizations are old results kept when a new smaller prime factor is found, which occasionally happens with ECM.