183 (number)

183 is the natural number following 182 and preceding 184.

In mathematics

183 is a perfect totient number, a number that is equal to the sum of its iterated totients.
Because, it is the number of points in a projective plane over the finite field. It is a repdigit in tredecimal. 183 is the fourth element of a divisibility sequence in which the th number can be computed as
for a transcendental number. This sequence counts the number of trees of height in which each node can have at most two children.
There are 183 different semiorders on four labeled elements.