239085991 has 2 divisors, whose sum is σ = 239085992. Its totient is φ = 239085990.

The previous prime is 239085967. The next prime is 239086007. The reversal of 239085991 is 199580932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 239085991 - 2⁷ = 239085863 is a prime.

It is a super-2 number, since 2×239085991² = 114324222184904162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239085191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119542995 + 119542996.

It is an arithmetic number, because the mean of its divisors is an integer number (119542996).

Almost surely, 2^239085991 is an apocalyptic number.

239085991 is a deficient number, since it is larger than the sum of its proper divisors (1).

239085991 is an equidigital number, since it uses as much as digits as its factorization.

239085991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 239085991 is about 15462.4057313214. The cubic root of 239085991 is about 620.6565980159.

The spelling of 239085991 in words is "two hundred thirty-nine million, eighty-five thousand, nine hundred ninety-one".