1 627 859 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
582101616189744494237988959	27	88.9	2011-12-07 18:26:43

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	134 / 640

Estimated T-Level: 26.0 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-04-05	Pete Dirksen	D972E223F071A15B	0
Verified (Factored)	1999-01-17	Vasilis Segos	D972E223F071A15B	1267331

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	DD2B818831C1AC6F	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-02	Oliver Kruse	FC59753B518E6F4E	1	0	1	3
Verified	2017-11-01	kkmrkkblmbrbk	FC59753B518E6F4E	1	420051	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	DD2B818831C1AC6F PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-11-01	kkmrkkblmbrbk	C-PRP	M1627859/582101616189744494237988959 : FC59753B518E6F4E PRP: Verified PRP without proof (not generated)
2017-10-02	Oliver Kruse	C-PRP	M1627859/582101616189744494237988959 : FC59753B518E6F4E PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-12-07	BigBrother	F-PM1	Factor: 582101616189744494237988959
2010-08-31	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-05-05	Architects Cubed	NF	no factor from 2^60 to 2^61