231531503223206 has 8 divisors (see below), whose sum is σ = 347297351235240. Its totient is φ = 115765719478128.

The previous prime is 231531503223193. The next prime is 231531503223247. The reversal of 231531503223206 is 602322305135132.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231531503223206.

It is a congruent number.

It is an unprimeable number.

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, 5730071 + ... + 22268738.

It is an arithmetic number, because the mean of its divisors is an integer number (43412168904405).

Almost surely, 2^{231531503223206} is an apocalyptic number.

231531503223206 is a deficient number, since it is larger than the sum of its proper divisors (115765848012034).

231531503223206 is a wasteful number, since it uses less digits than its factorization.

231531503223206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32133478.

The product of its (nonzero) digits is 194400, while the sum is 38.

Adding to 231531503223206 its reverse (602322305135132), we get a palindrome (833853808358338).

The spelling of 231531503223206 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, five hundred three million, two hundred twenty-three thousand, two hundred six".