231135139 has 2 divisors, whose sum is σ = 231135140. Its totient is φ = 231135138.

The previous prime is 231135137. The next prime is 231135169. The reversal of 231135139 is 931531132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231135139 - 2¹ = 231135137 is a prime.

Together with 231135137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231135131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115567569 + 115567570.

It is an arithmetic number, because the mean of its divisors is an integer number (115567570).

Almost surely, 2^231135139 is an apocalyptic number.

231135139 is a deficient number, since it is larger than the sum of its proper divisors (1).

231135139 is an equidigital number, since it uses as much as digits as its factorization.

231135139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 28.

The square root of 231135139 is about 15203.1292502563. The cubic root of 231135139 is about 613.6988721352.

The spelling of 231135139 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred thirty-nine".