1311347443 has 4 divisors (see below), whose sum is σ = 1498682800. Its totient is φ = 1124012088.

The previous prime is 1311347441. The next prime is 1311347473. The reversal of 1311347443 is 3447431131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3447431131 = 43 ⋅80172817.

It is a cyclic number.

It is not a de Polignac number, because 1311347443 - 2¹ = 1311347441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311347441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93667668 + ... + 93667681.

It is an arithmetic number, because the mean of its divisors is an integer number (374670700).

Almost surely, 2^1311347443 is an apocalyptic number.

1311347443 is a deficient number, since it is larger than the sum of its proper divisors (187335357).

1311347443 is an equidigital number, since it uses as much as digits as its factorization.

1311347443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187335356.

The product of its digits is 12096, while the sum is 31.

The square root of 1311347443 is about 36212.5315740283. The cubic root of 1311347443 is about 1094.5592056911.

Adding to 1311347443 its reverse (3447431131), we get a palindrome (4758778574).

The spelling of 1311347443 in words is "one billion, three hundred eleven million, three hundred forty-seven thousand, four hundred forty-three".