1311312443 has 4 divisors (see below), whose sum is σ = 1498642800. Its totient is φ = 1123982088.

The previous prime is 1311312433. The next prime is 1311312451. The reversal of 1311312443 is 3442131131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3442131131 = 359 ⋅9588109.

It is a cyclic number.

It is not a de Polignac number, because 1311312443 - 2¹⁴ = 1311296059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311312433) 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, 93665168 + ... + 93665181.

It is an arithmetic number, because the mean of its divisors is an integer number (374660700).

Almost surely, 2^1311312443 is an apocalyptic number.

1311312443 is a deficient number, since it is larger than the sum of its proper divisors (187330357).

1311312443 is an equidigital number, since it uses as much as digits as its factorization.

1311312443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187330356.

The product of its digits is 864, while the sum is 23.

The square root of 1311312443 is about 36212.0483126818. The cubic root of 1311312443 is about 1094.5494676380.

Adding to 1311312443 its reverse (3442131131), we get a palindrome (4753443574).

The spelling of 1311312443 in words is "one billion, three hundred eleven million, three hundred twelve thousand, four hundred forty-three".