191238239 has 2 divisors, whose sum is σ = 191238240. Its totient is φ = 191238238.

The previous prime is 191238199. The next prime is 191238263. The reversal of 191238239 is 932832191.

191238239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191238239 - 2²⁰ = 190189663 is a prime.

It is a super-2 number, since 2×191238239² = 73144128111642242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191238139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95619119 + 95619120.

It is an arithmetic number, because the mean of its divisors is an integer number (95619120).

Almost surely, 2^191238239 is an apocalyptic number.

191238239 is a deficient number, since it is larger than the sum of its proper divisors (1).

191238239 is an equidigital number, since it uses as much as digits as its factorization.

191238239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 191238239 is about 13828.8914595495. The cubic root of 191238239 is about 576.1358658647.

The spelling of 191238239 in words is "one hundred ninety-one million, two hundred thirty-eight thousand, two hundred thirty-nine".