Mich. Comp. Laws § 500.6402

Sec. 6402. Subject to the requirements of chapter 50 (organization of domestic insurers) and 52 (corporate powers, procedures of domestic insurers), any number of persons, not less than 7, residents of this state, may incorporate for the purpose of carrying on upon the assessment or cooperative plan, the kind or kinds of insurance enumerated in any 1 or more subdivisions of section 6406.