231311233 has 8 divisors (see below), whose sum is σ = 236953728. Its totient is φ = 225680784.

The previous prime is 231311219. The next prime is 231311251. The reversal of 231311233 is 332113132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311233 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 231311233.

It is not an unprimeable number, because it can be changed into a prime (231311203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44991 + ... + 49867.

It is an arithmetic number, because the mean of its divisors is an integer number (29619216).

Almost surely, 2^231311233 is an apocalyptic number.

It is an amenable number.

231311233 is a deficient number, since it is larger than the sum of its proper divisors (5642495).

231311233 is a wasteful number, since it uses less digits than its factorization.

231311233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023.

The product of its digits is 324, while the sum is 19.

The square root of 231311233 is about 15208.9195211231. The cubic root of 231311233 is about 613.8546846707.

Adding to 231311233 its reverse (332113132), we get a palindrome (563424365).

The spelling of 231311233 in words is "two hundred thirty-one million, three hundred eleven thousand, two hundred thirty-three".