55120189 has 2 divisors, whose sum is σ = 55120190. Its totient is φ = 55120188.

The previous prime is 55120147. The next prime is 55120283. The reversal of 55120189 is 98102155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44328964 + 10791225 = 6658^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 55120189 - 2⁷ = 55120061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55120189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55120789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27560094 + 27560095.

It is an arithmetic number, because the mean of its divisors is an integer number (27560095).

Almost surely, 2^55120189 is an apocalyptic number.

It is an amenable number.

55120189 is a deficient number, since it is larger than the sum of its proper divisors (1).

55120189 is an equidigital number, since it uses as much as digits as its factorization.

55120189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 55120189 is about 7424.2972057967. The cubic root of 55120189 is about 380.5720585104.

The spelling of 55120189 in words is "fifty-five million, one hundred twenty thousand, one hundred eighty-nine".