1231111222 has 8 divisors (see below), whose sum is σ = 2014545672. Its totient is φ = 559596000.

The previous prime is 1231111177. The next prime is 1231111307. The reversal of 1231111222 is 2221111321.

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

It is a junction number, because it is equal to n+sod(n) for n = 1231111196 and 1231111205.

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, 27979779 + ... + 27979822.

It is an arithmetic number, because the mean of its divisors is an integer number (251818209).

Almost surely, 2^1231111222 is an apocalyptic number.

1231111222 is a deficient number, since it is larger than the sum of its proper divisors (783434450).

1231111222 is a wasteful number, since it uses less digits than its factorization.

1231111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55959614.

The product of its digits is 48, while the sum is 16.

The square root of 1231111222 is about 35087.1945586990. The cubic root of 1231111222 is about 1071.7638308684.

Adding to 1231111222 its reverse (2221111321), we get a palindrome (3452222543).

Subtracting 1231111222 from its reverse (2221111321), we obtain a palindrome (990000099).

The spelling of 1231111222 in words is "one billion, two hundred thirty-one million, one hundred eleven thousand, two hundred twenty-two".