231311222 has 8 divisors (see below), whose sum is σ = 347569896. Its totient is φ = 115454592.

The previous prime is 231311219. The next prime is 231311251. The reversal of 231311222 is 222113132.

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

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 231311222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99068 + ... + 101375.

It is an arithmetic number, because the mean of its divisors is an integer number (43446237).

Almost surely, 2^231311222 is an apocalyptic number.

231311222 is a deficient number, since it is larger than the sum of its proper divisors (116258674).

231311222 is a wasteful number, since it uses less digits than its factorization.

231311222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201022.

The product of its digits is 144, while the sum is 17.

The square root of 231311222 is about 15208.9191594932. The cubic root of 231311222 is about 613.8546749401.

Adding to 231311222 its reverse (222113132), we get a palindrome (453424354).

The spelling of 231311222 in words is "two hundred thirty-one million, three hundred eleven thousand, two hundred twenty-two".