189549989 has 2 divisors, whose sum is σ = 189549990. Its totient is φ = 189549988.

The previous prime is 189549979. The next prime is 189550069. The reversal of 189549989 is 989945981.

189549989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120077764 + 69472225 = 10958^2 + 8335^2 .

It is a cyclic number.

It is not a de Polignac number, because 189549989 - 2¹⁶ = 189484453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189549959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94774994 + 94774995.

It is an arithmetic number, because the mean of its divisors is an integer number (94774995).

Almost surely, 2^189549989 is an apocalyptic number.

It is an amenable number.

189549989 is a deficient number, since it is larger than the sum of its proper divisors (1).

189549989 is an equidigital number, since it uses as much as digits as its factorization.

189549989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 62.

The square root of 189549989 is about 13767.7154604531. The cubic root of 189549989 is about 574.4354777039.

The spelling of 189549989 in words is "one hundred eighty-nine million, five hundred forty-nine thousand, nine hundred eighty-nine".