231531503223222 has 48 divisors (see below), whose sum is σ = 508237028252928. Its totient is φ = 76168906070400.

The previous prime is 231531503223193. The next prime is 231531503223247. The reversal of 231531503223222 is 222322305135132.

231531503223222 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 3 + 1 + 5 + 0 + 322 + 322 + 2 = 666.

It is a super-2 number, since 2×231531503223222² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202873558 + ... + 204011625.

It is an arithmetic number, because the mean of its divisors is an integer number (10588271421936).

Almost surely, 2^{231531503223222} is an apocalyptic number.

231531503223222 is an abundant number, since it is smaller than the sum of its proper divisors (276705525029706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231531503223222 is a wasteful number, since it uses less digits than its factorization.

231531503223222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406885605 (or 406885602 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 231531503223222 its reverse (222322305135132), we get a palindrome (453853808358354).

The spelling of 231531503223222 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, five hundred three million, two hundred twenty-three thousand, two hundred twenty-two".