55978189 has 2 divisors, whose sum is σ = 55978190. Its totient is φ = 55978188.

The previous prime is 55978163. The next prime is 55978201. The reversal of 55978189 is 98187955.

55978189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38962564 + 17015625 = 6242^2 + 4125^2 .

It is a cyclic number.

It is not a de Polignac number, because 55978189 - 2⁷ = 55978061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55978289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27989094 + 27989095.

It is an arithmetic number, because the mean of its divisors is an integer number (27989095).

Almost surely, 2^55978189 is an apocalyptic number.

It is an amenable number.

55978189 is a deficient number, since it is larger than the sum of its proper divisors (1).

55978189 is an equidigital number, since it uses as much as digits as its factorization.

55978189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 52.

The square root of 55978189 is about 7481.8573228845. The cubic root of 55978189 is about 382.5365599355.

The spelling of 55978189 in words is "fifty-five million, nine hundred seventy-eight thousand, one hundred eighty-nine".