Northern Mariana Islands is about 540 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while Northern Mariana Islands is approximately 464 sq km, making Northern Mariana Islands 0.19% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (9.8 million fewer people live in Northern Mariana Islands).
Tip: This to-scale comparison of Michigan vs. Northern Mariana Islands uses the Mercator projection, which distorts the size of regions near the poles.