It's about 0.0000000000000000000000000010 times as heavy as The Sun
In other words, 31,000,000 grains is 0.000000000000000000000000001000 times the weight of The Sun, and the weight of The Sun is 1,000,000,000,000,000,013,287,555,072.000000000000000000000000000000 times that amount.The sun has a mass of 31,000,000,000,000,001,757,761,616,363,586,060,288.0000000000000000000000000000000000000000 grains which represents 99.9% of the solar system's total mass. 98.7% of the sun's mass consists of hydrogen and helium — respectively the lightest and second-lightest elements in the universe.
It's about 0.0000000000000000000004 times as heavy as The Earth
In other words, 31,000,000 grains is 0.000000000000000000000336270 times the weight of The Earth, and the weight of The Earth is 2,973,799,999,999,999,737,856.000000000000000000000000000 times that amount.The mass of the planet Earth is 92,186,999,999,999,991,788,106,416,128.0000000000000000000000000000000000 grains. The element iron makes up about 32% of that mass, or 29,591,999,999,999,999,542,183,329,792.0000000000000000000000000000000000 grains.
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 one-four-hundred-thousandth as heavy as The Golden Gate Bridge
In other words, 31,000,000 grains is 0.00000250 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 400,000 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 12,400,000,000,000 grains. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about one-one-hundred-fifty-thousandth as heavy as The Empire State Building
In other words, 31,000,000 grains is 0.000006070 times the weight of The Empire State Building, and the weight of The Empire State Building is 165,000 times that amount.(New York City, New York)
The Empire State Building weighs approximately 5,110,000,000,000 grains. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about one-one-hundred-thousandth as heavy as The Sears Tower
In other words, 31,000,000 grains is 0.0000099540 times the weight of The Sears Tower, and the weight of The Sears Tower is 100,500 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 3,114,000,000,000 grains. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about one-sixty-thousandth as heavy as The CN Tower
In other words, 31,000,000 grains is 0.0000170360 times the weight of The CN Tower, and the weight of The CN Tower is 58,699 times that amount.(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 1,819,600,000,000 grains. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.