189389191 has 2 divisors, whose sum is σ = 189389192. Its totient is φ = 189389190.

The previous prime is 189389177. The next prime is 189389203. The reversal of 189389191 is 191983981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189389191 - 2⁹ = 189388679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189389491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94694595 + 94694596.

It is an arithmetic number, because the mean of its divisors is an integer number (94694596).

Almost surely, 2^189389191 is an apocalyptic number.

189389191 is a deficient number, since it is larger than the sum of its proper divisors (1).

189389191 is an equidigital number, since it uses as much as digits as its factorization.

189389191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 49.

The square root of 189389191 is about 13761.8745452791. The cubic root of 189389191 is about 574.2729977730.

The spelling of 189389191 in words is "one hundred eighty-nine million, three hundred eighty-nine thousand, one hundred ninety-one".