The number 1 is the first natural number after 0. Each natural number, including 1, is constructed by succession, that is, by adding 1 to the previous natural number. The number 1 is the multiplicative identity of the integers, real numbers, and complex numbers, that is, any number n multiplied by 1 remains unchanged
(1 x n = n x 1 = n) As a result, the square (1² = 1), square root (√1 = 1) and any other power of 1 is always equal to 1 itself. 1 is its own factorial (1! = 1), and 0! Is also 1.