1231122112 has 56 divisors (see below), whose sum is σ = 2674144512. Its totient is φ = 557702400.

The previous prime is 1231122097. The next prime is 1231122187. The reversal of 1231122112 is 2112211321.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216133 + ... + 221755.

Almost surely, 2^1231122112 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 1231122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1337072256).

1231122112 is an abundant number, since it is smaller than the sum of its proper divisors (1443022400).

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

1231122112 is a wasteful number, since it uses less digits than its factorization.

1231122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5947 counting only the distinct ones).

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

The square root of 1231122112 is about 35087.3497431767. The cubic root of 1231122112 is about 1071.7669910144.

Adding to 1231122112 its reverse (2112211321), we get a palindrome (3343333433).

The spelling of 1231122112 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred twelve".