55242189 has 16 divisors (see below), whose sum is σ = 82995840. Its totient is φ = 36308160.

The previous prime is 55242169. The next prime is 55242191. The reversal of 55242189 is 98124255.

55242189 is a `hidden beast` number, since 552 + 4 + 21 + 89 = 666.

It is not a de Polignac number, because 55242189 - 2⁸ = 55241933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55242169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12492 + ... + 16325.

It is an arithmetic number, because the mean of its divisors is an integer number (5187240).

Almost surely, 2^55242189 is an apocalyptic number.

It is an amenable number.

55242189 is a deficient number, since it is larger than the sum of its proper divisors (27753651).

55242189 is a wasteful number, since it uses less digits than its factorization.

55242189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28897 (or 28891 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 55242189 is about 7432.5089303680. The cubic root of 55242189 is about 380.8526307109.

The spelling of 55242189 in words is "fifty-five million, two hundred forty-two thousand, one hundred eighty-nine".