231031223 has 2 divisors, whose sum is σ = 231031224. Its totient is φ = 231031222.

The previous prime is 231031201. The next prime is 231031253. The reversal of 231031223 is 322130132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231031223 - 2¹⁶ = 230965687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231031253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115515611 + 115515612.

It is an arithmetic number, because the mean of its divisors is an integer number (115515612).

Almost surely, 2^231031223 is an apocalyptic number.

231031223 is a deficient number, since it is larger than the sum of its proper divisors (1).

231031223 is an equidigital number, since it uses as much as digits as its factorization.

231031223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231031223 is about 15199.7112801527. The cubic root of 231031223 is about 613.6068874318.

Adding to 231031223 its reverse (322130132), we get a palindrome (553161355).

It can be divided in two parts, 2310 and 31223, that added together give a palindrome (33533).

The spelling of 231031223 in words is "two hundred thirty-one million, thirty-one thousand, two hundred twenty-three".