231118431 has 4 divisors (see below), whose sum is σ = 308157912. Its totient is φ = 154078952.

The previous prime is 231118427. The next prime is 231118439. The reversal of 231118431 is 134811132.

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

It is a cyclic number.

It is not a de Polignac number, because 231118431 - 2² = 231118427 is a prime.

It is a super-3 number, since 3×231118431³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231118439) 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, 38519736 + ... + 38519741.

It is an arithmetic number, because the mean of its divisors is an integer number (77039478).

Almost surely, 2^231118431 is an apocalyptic number.

231118431 is a deficient number, since it is larger than the sum of its proper divisors (77039481).

231118431 is an equidigital number, since it uses as much as digits as its factorization.

231118431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77039480.

The product of its digits is 576, while the sum is 24.

The square root of 231118431 is about 15202.5797481875. The cubic root of 231118431 is about 613.6840843536.

Adding to 231118431 its reverse (134811132), we get a palindrome (365929563).

The spelling of 231118431 in words is "two hundred thirty-one million, one hundred eighteen thousand, four hundred thirty-one".