Hundred eleven

The one hundred and eleven (111) is the natural number that follows 110 and precedes 112.

In mathematics

• 111 is a composite number, which has the following factors: 1, 3 and 37. As the sum of its factors is 44 ≤ 111, it is a defective number.
• It's a Harshad number and a Moran number.
• It is the first redigit of three figures in the series of natural numbers.

In science

• 111 is the atomic number of roentgenium.

In other fields

• It's the emergency phone number in New Zealand.
• The chemical compound 1.1.1-trichloroethane is a chlorinated hydrocarbon that was used as an industrial solvent with the commercial name "Solvent 111".