1311111111232 has 56 divisors (see below), whose sum is σ = 2805386597496. Its totient is φ = 604368642048.

The previous prime is 1311111111223. The next prime is 1311111111239. The reversal of 1311111111232 is 2321111111131.

It can be written as a sum of positive squares in 4 ways, for example, as 14300333056 + 1296810778176 = 119584^2 + 1138776^2 .

It is not an unprimeable number, because it can be changed into a prime (1311111111239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325513 + ... + 1651720.

It is an arithmetic number, because the mean of its divisors is an integer number (50096189241).

Almost surely, 2^{1311111111232} is an apocalyptic number.

It is an amenable number.

1311111111232 is an abundant number, since it is smaller than the sum of its proper divisors (1494275486264).

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

1311111111232 is a wasteful number, since it uses less digits than its factorization.

1311111111232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978055 (or 1978045 counting only the distinct ones).

The product of its digits is 36, while the sum is 19.

Adding to 1311111111232 its reverse (2321111111131), we get a palindrome (3632222222363).

The spelling of 1311111111232 in words is "one trillion, three hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred thirty-two".