The Number 1861: Properties and Meanings1861 is a Prime Number.
1861 is a Centered Square Number.
The Year 1861 ADIn the year 1861 AD Elisha Otis patented elevator safety brakes, creating a safer elevator.
In the year 1861 AD Pierre Michaux invented a bicycle.
In the year 1861 AD Linus Yale invented the Yale lock or cylinder lock.
In the year 1861 AD the Chemical Element Thallium was first discovered by Sir William Crookes.
In the year 1861 AD Rudolf Steiner was born.(Esoteric History)