231431223 has 16 divisors (see below), whose sum is σ = 321562080. Its totient is φ = 147872256.

The previous prime is 231431219. The next prime is 231431237. The reversal of 231431223 is 322134132.

It is not a de Polignac number, because 231431223 - 2² = 231431219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231431223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431023) 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 15 ways as a sum of consecutive naturals, for example, 2211 + ... + 21627.

It is an arithmetic number, because the mean of its divisors is an integer number (20097630).

Almost surely, 2^231431223 is an apocalyptic number.

231431223 is a deficient number, since it is larger than the sum of its proper divisors (90130857).

231431223 is a wasteful number, since it uses less digits than its factorization.

231431223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19586.

The product of its digits is 864, while the sum is 21.

The square root of 231431223 is about 15212.8637343532. The cubic root of 231431223 is about 613.9608096381.

Adding to 231431223 its reverse (322134132), we get a palindrome (553565355).

The spelling of 231431223 in words is "two hundred thirty-one million, four hundred thirty-one thousand, two hundred twenty-three".