31 is the third Mersenne prime (25 − 1) and the eighth Mersenne prime exponent, as well as the fourth primorial prime, and together with twenty-nine, another primorial prime, it comprises a twin prime. As a Mersenne prime, 31 is related to the perfect number 496, since 496 = 2(5 − 1)(25 − 1). 31 is also the 4th lucky prime and the 11th supersingular prime.
Aubrey – I have two 31 Utility Totes, two bags from Amazon and one from Walmart. The bags from Amazon are cheaper than 31 bags but are every bit as good in terms of quality. Further, the Walmart bag cost the least but, in my opinion, is the best bag. The only downside is there aren’t many fabric choices. Also, I had another 31 bag that I bought as a work bag, it was expensive and it fell apart. I do like the 31 bags (I think the fabric is pretty) but I would rather save money. https://i.pinimg.com/originals/77/e4/e6/77e4e6065aee3eeb45fe498dd19e14ad.jpg