55138189 has 2 divisors, whose sum is σ = 55138190. Its totient is φ = 55138188.

The previous prime is 55138183. The next prime is 55138201. The reversal of 55138189 is 98183155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30437289 + 24700900 = 5517^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 55138189 - 2¹⁹ = 54613901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55138183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27569094 + 27569095.

It is an arithmetic number, because the mean of its divisors is an integer number (27569095).

Almost surely, 2^55138189 is an apocalyptic number.

It is an amenable number.

55138189 is a deficient number, since it is larger than the sum of its proper divisors (1).

55138189 is an equidigital number, since it uses as much as digits as its factorization.

55138189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 40.

The square root of 55138189 is about 7425.5093427993. The cubic root of 55138189 is about 380.6134804264.

The spelling of 55138189 in words is "fifty-five million, one hundred thirty-eight thousand, one hundred eighty-nine".