1311211232 has 24 divisors (see below), whose sum is σ = 2693685456. Its totient is φ = 627100672.

The previous prime is 1311211219. The next prime is 1311211243. The reversal of 1311211232 is 2321121131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311211232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890033 + ... + 891504.

It is an arithmetic number, because the mean of its divisors is an integer number (112236894).

Almost surely, 2^1311211232 is an apocalyptic number.

It is an amenable number.

1311211232 is an abundant number, since it is smaller than the sum of its proper divisors (1382474224).

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

1311211232 is a wasteful number, since it uses less digits than its factorization.

1311211232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781570 (or 1781562 counting only the distinct ones).

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

The square root of 1311211232 is about 36210.6508088435. The cubic root of 1311211232 is about 1094.5213067175.

Adding to 1311211232 its reverse (2321121131), we get a palindrome (3632332363).

The spelling of 1311211232 in words is "one billion, three hundred eleven million, two hundred eleven thousand, two hundred thirty-two".