189761389 has 2 divisors, whose sum is σ = 189761390. Its totient is φ = 189761388.

The previous prime is 189761357. The next prime is 189761399. The reversal of 189761389 is 983167981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183385764 + 6375625 = 13542^2 + 2525^2 .

It is an emirp because it is prime and its reverse (983167981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189761389 - 2⁵ = 189761357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189761309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94880694 + 94880695.

It is an arithmetic number, because the mean of its divisors is an integer number (94880695).

Almost surely, 2^189761389 is an apocalyptic number.

It is an amenable number.

189761389 is a deficient number, since it is larger than the sum of its proper divisors (1).

189761389 is an equidigital number, since it uses as much as digits as its factorization.

189761389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The square root of 189761389 is about 13775.3907022632. The cubic root of 189761389 is about 574.6489491720.

The spelling of 189761389 in words is "one hundred eighty-nine million, seven hundred sixty-one thousand, three hundred eighty-nine".