1231121632 has 24 divisors (see below), whose sum is σ = 2610215496. Its totient is φ = 568209792.

The previous prime is 1231121597. The next prime is 1231121669. The reversal of 1231121632 is 2361211321.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1479298 + ... + 1480129.

It is an arithmetic number, because the mean of its divisors is an integer number (108758979).

Almost surely, 2^1231121632 is an apocalyptic number.

It is an amenable number.

1231121632 is an abundant number, since it is smaller than the sum of its proper divisors (1379093864).

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

1231121632 is a wasteful number, since it uses less digits than its factorization.

1231121632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959450 (or 2959442 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 1231121632 is about 35087.3429031040. The cubic root of 1231121632 is about 1071.7668517246.

Adding to 1231121632 its reverse (2361211321), we get a palindrome (3592332953).

The spelling of 1231121632 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, six hundred thirty-two".