1311403043 has 4 divisors (see below), whose sum is σ = 1324922760. Its totient is φ = 1297883328.

The previous prime is 1311403033. The next prime is 1311403057. The reversal of 1311403043 is 3403041131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311403043 - 2⁶ = 1311402979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311403033) 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, 6759713 + ... + 6759906.

It is an arithmetic number, because the mean of its divisors is an integer number (331230690).

Almost surely, 2^1311403043 is an apocalyptic number.

1311403043 is a deficient number, since it is larger than the sum of its proper divisors (13519717).

1311403043 is an equidigital number, since it uses as much as digits as its factorization.

1311403043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13519716.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1311403043 is about 36213.2992559363. The cubic root of 1311403043 is about 1094.5746749278.

Adding to 1311403043 its reverse (3403041131), we get a palindrome (4714444174).

The spelling of 1311403043 in words is "one billion, three hundred eleven million, four hundred three thousand, forty-three".