1231111232 has 112 divisors (see below), whose sum is σ = 2830007040. Its totient is φ = 526528512.

The previous prime is 1231111177. The next prime is 1231111307. The reversal of 1231111232 is 2321111321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231111232.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 742148 + ... + 743804.

It is an arithmetic number, because the mean of its divisors is an integer number (25267920).

Almost surely, 2^1231111232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231111232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415003520).

1231111232 is an abundant number, since it is smaller than the sum of its proper divisors (1598895808).

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

1231111232 is a wasteful number, since it uses less digits than its factorization.

1231111232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1738 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1231111232 is about 35087.1947012012. The cubic root of 1231111232 is about 1071.7638337703.

Adding to 1231111232 its reverse (2321111321), we get a palindrome (3552222553).

The spelling of 1231111232 in words is "one billion, two hundred thirty-one million, one hundred eleven thousand, two hundred thirty-two".