It's about 2,000,000 times as heavy as a Jelly Bean
In other words, 31,000,000 grains is 1,800,000 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 0.000000560 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 18 grains. President Ronald Reagan cited jelly beans as his favorite candy and 49,000,000 grains of the candies were served at his first inauguration in 1981.
It's about 2,500,000 times as heavy as a Nail
It's about 0.0000004 times as heavy as The Great Pyramid of Giza
In other words, 31,000,000 grains is 0.000000340 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 2,900,000 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 91,000,000,000,000 grains. The 2,300,000 stones used in the construction of the pyramid weighed an average 35,000,000 grains and were quarried from distances of up to 805 km (500 mi) away.
It's about 10,000,000 times as heavy as a Raindrop
In other words, the weight of a Raindrop is 0.0000001000 times 31,000,000 grains.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 3 grains. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about 95,000,000 times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.00000001000 times 31,000,000 grains.(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 0.320 grains before cooking. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 450,000,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.00000000220 times 31,000,000 grains.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.068 grains. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 550,000,000 times as heavy as a Sesame Seed
In other words, 31,000,000 grains is 552,000,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.000000001810 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.0562 grains. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 31,000,000 grains of sesame seeds each day.