231310331 has 12 divisors (see below), whose sum is σ = 273095208. Its totient is φ = 195304032.

The previous prime is 231310327. The next prime is 231310349. The reversal of 231310331 is 133013132.

It is not a de Polignac number, because 231310331 - 2² = 231310327 is a prime.

It is a super-2 number, since 2×231310331² = 107008938454659122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231310361) 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 11 ways as a sum of consecutive naturals, for example, 31946 + ... + 38511.

It is an arithmetic number, because the mean of its divisors is an integer number (22757934).

Almost surely, 2^231310331 is an apocalyptic number.

231310331 is a deficient number, since it is larger than the sum of its proper divisors (41784877).

231310331 is an equidigital number, since it uses as much as digits as its factorization.

231310331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70538 (or 70531 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 231310331 is about 15208.8898674427. The cubic root of 231310331 is about 613.8538867593.

Adding to 231310331 its reverse (133013132), we get a palindrome (364323463).

The spelling of 231310331 in words is "two hundred thirty-one million, three hundred ten thousand, three hundred thirty-one".