1311342443 has 2 divisors, whose sum is σ = 1311342444. Its totient is φ = 1311342442.

The previous prime is 1311342433. The next prime is 1311342449. The reversal of 1311342443 is 3442431131.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3442431131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311342443 - 2⁴ = 1311342427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311342449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655671221 + 655671222.

It is an arithmetic number, because the mean of its divisors is an integer number (655671222).

Almost surely, 2^1311342443 is an apocalyptic number.

1311342443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311342443 is an equidigital number, since it uses as much as digits as its factorization.

1311342443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 1311342443 is about 36212.4625370880. The cubic root of 1311342443 is about 1094.5578145513.

Adding to 1311342443 its reverse (3442431131), we get a palindrome (4753773574).

The spelling of 1311342443 in words is "one billion, three hundred eleven million, three hundred forty-two thousand, four hundred forty-three".