231135239 has 2 divisors, whose sum is σ = 231135240. Its totient is φ = 231135238.

The previous prime is 231135199. The next prime is 231135253. The reversal of 231135239 is 932531132.

231135239 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 a de Polignac number, because none of the positive numbers 2^k-231135239 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231135269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115567619 + 115567620.

It is an arithmetic number, because the mean of its divisors is an integer number (115567620).

Almost surely, 2^231135239 is an apocalyptic number.

231135239 is a deficient number, since it is larger than the sum of its proper divisors (1).

231135239 is an equidigital number, since it uses as much as digits as its factorization.

231135239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 29.

The square root of 231135239 is about 15203.1325390526. The cubic root of 231135239 is about 613.6989606402.

The spelling of 231135239 in words is "two hundred thirty-one million, one hundred thirty-five thousand, two hundred thirty-nine".