189245891 has 2 divisors, whose sum is σ = 189245892. Its totient is φ = 189245890.

The previous prime is 189245827. The next prime is 189245899. The reversal of 189245891 is 198542981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189245891 - 2⁶ = 189245827 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189245899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94622945 + 94622946.

It is an arithmetic number, because the mean of its divisors is an integer number (94622946).

Almost surely, 2^189245891 is an apocalyptic number.

189245891 is a deficient number, since it is larger than the sum of its proper divisors (1).

189245891 is an equidigital number, since it uses as much as digits as its factorization.

189245891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 189245891 is about 13756.6671472417. The cubic root of 189245891 is about 574.1281213514.

The spelling of 189245891 in words is "one hundred eighty-nine million, two hundred forty-five thousand, eight hundred ninety-one".