191765089 has 2 divisors, whose sum is σ = 191765090. Its totient is φ = 191765088.

The previous prime is 191765071. The next prime is 191765129. The reversal of 191765089 is 980567191.

It is a happy number.

191765089 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., 164044864 + 27720225 = 12808^2 + 5265^2 .

It is a cyclic number.

It is not a de Polignac number, because 191765089 - 2⁹ = 191764577 is a prime.

It is not a weakly prime, because it can be changed into another prime (191762089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95882544 + 95882545.

It is an arithmetic number, because the mean of its divisors is an integer number (95882545).

Almost surely, 2^191765089 is an apocalyptic number.

It is an amenable number.

191765089 is a deficient number, since it is larger than the sum of its proper divisors (1).

191765089 is an equidigital number, since it uses as much as digits as its factorization.

191765089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 191765089 is about 13847.9272456206. The cubic root of 191765089 is about 576.6644541256.

The spelling of 191765089 in words is "one hundred ninety-one million, seven hundred sixty-five thousand, eighty-nine".