Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1598131Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
5384406983890011548.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel2498C796EA061F0B013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-02Oliver KruseA691B8F2264FA81A1013
Verified2017-10-31ATHA691B8F2264FA81A127577513
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
2498C796EA061F0B
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-31ATHC-PRP
M1598131/538440698389001 : A691B8F2264FA81A
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1598131/538440698389001 : A691B8F2264FA81A
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12