1311531134432 has 12 divisors (see below), whose sum is σ = 2582076920976. Its totient is φ = 655765567200.

The previous prime is 1311531134413. The next prime is 1311531134447. The reversal of 1311531134432 is 2344311351131.

It is a super-2 number, since 2×1311531134432² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 40985347951 = 1311531134432 / (1 + 3 + 1 + 1 + 5 + 3 + 1 + 1 + 3 + 4 + 4 + 3 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20492673944 + ... + 20492674007.

It is an arithmetic number, because the mean of its divisors is an integer number (215173076748).

Almost surely, 2^{1311531134432} is an apocalyptic number.

It is an amenable number.

1311531134432 is a deficient number, since it is larger than the sum of its proper divisors (1270545786544).

1311531134432 is an equidigital number, since it uses as much as digits as its factorization.

1311531134432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40985347961 (or 40985347953 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

Adding to 1311531134432 its reverse (2344311351131), we get a palindrome (3655842485563).

The spelling of 1311531134432 in words is "one trillion, three hundred eleven billion, five hundred thirty-one million, one hundred thirty-four thousand, four hundred thirty-two".