231135123 has 4 divisors (see below), whose sum is σ = 308180168. Its totient is φ = 154090080.

The previous prime is 231135103. The next prime is 231135131. The reversal of 231135123 is 321531132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231135123 - 2¹⁴ = 231118739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231135123.

It is not an unprimeable number, because it can be changed into a prime (231135103) 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 in 3 ways as a sum of consecutive naturals, for example, 38522518 + ... + 38522523.

It is an arithmetic number, because the mean of its divisors is an integer number (77045042).

Almost surely, 2^231135123 is an apocalyptic number.

231135123 is a deficient number, since it is larger than the sum of its proper divisors (77045045).

231135123 is an equidigital number, since it uses as much as digits as its factorization.

231135123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77045044.

The product of its digits is 540, while the sum is 21.

The square root of 231135123 is about 15203.1287240489. The cubic root of 231135123 is about 613.6988579744.

Adding to 231135123 its reverse (321531132), we get a palindrome (552666255).

The spelling of 231135123 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred twenty-three".