1 785 367 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
808789104671	12	39.6	old
1167505286568287408017	22	70.0	2015-06-21 12:36:01

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	Type	Base
Verified (Factored)	2025-09-02	Kriesel	1E428459EDD1F11E	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	D863762F9EBC6345	2	0	1	3
Verified	2017-10-19	Oliver Kruse	D863762F9EBC6345	2	473445	1	3

P-1 factors

Date	Factor	B1	B2
2015-06-21	1167505286568287408017	500000	15000000

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	1E428459EDD1F11E PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-10-19	Oliver Kruse	C-PRP	M1785367/808789104671/1167505286568287408017 : D863762F9EBC6345 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1785367/1167505286568287408017/808789104671 : D863762F9EBC6345 PRP: Verified PRP without proof (not generated)
2015-06-21	alpertron	F-PM1	Factor: 1167505286568287408017 / (P-1, B1=500000, B2=15000000, E=12)