189183889 has 2 divisors, whose sum is σ = 189183890. Its totient is φ = 189183888.

The previous prime is 189183887. The next prime is 189183941. The reversal of 189183889 is 988381981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126900225 + 62283664 = 11265^2 + 7892^2 .

It is an emirp because it is prime and its reverse (988381981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189183889 - 2¹ = 189183887 is a prime.

Together with 189183887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189183887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94591944 + 94591945.

It is an arithmetic number, because the mean of its divisors is an integer number (94591945).

Almost surely, 2^189183889 is an apocalyptic number.

It is an amenable number.

189183889 is a deficient number, since it is larger than the sum of its proper divisors (1).

189183889 is an equidigital number, since it uses as much as digits as its factorization.

189183889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 55.

The square root of 189183889 is about 13754.4134371481. The cubic root of 189183889 is about 574.0654146090.

The spelling of 189183889 in words is "one hundred eighty-nine million, one hundred eighty-three thousand, eight hundred eighty-nine".