1 577 489 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
2078470585958464128264241	25	80.8	2016-11-02 21:16:02

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-06-14	Vincent Endter	44D4EE3D27B7CA2D	0
Verified (Factored)	1998-11-21	Jaanus Kivistik	44D4EE3D27B7CA2D	952250
Verified (Factored)	2015-07-20	MadPoo	44D4EE3D27B7CA2D	658516

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	24BF4ED847589BB8	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-01	Oliver Kruse	12069A1A57632A73	1	0	1	3
Verified	2017-10-31	kkmrkkblmbrbk	12069A1A57632A73	1	479652	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	24BF4ED847589BB8 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-10-31	kkmrkkblmbrbk	C-PRP	M1577489/2078470585958464128264241 : 12069A1A57632A73 PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1577489/2078470585958464128264241 : 12069A1A57632A73 PRP: Verified PRP without proof (not generated)
2016-11-02	VictordeHollander	F-ECM	Factor: 2078470585958464128264241 / (ECM curve 29, B1=50000, B2=5000000)
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-10-11	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-20	MadPoo	C-LL	44D4EE3D27B7CA2D
2015-04-05	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2015-02-27	snme2pm1	NF	no factor from 2^64 to 2^65
2015-02-27	snme2pm1	NF	no factor from 2^63 to 2^64
2013-12-13	David Campeau	NF-PM1	B1=970000, B2=28130000, E=12
2011-02-01	James Heinrich	NF-PM1	B1=85000, B2=1402500, E=6
2010-06-14	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-05-04	Architects Cubed	NF	no factor from 2^60 to 2^61