1311330403 has 4 divisors (see below), whose sum is σ = 1313120128. Its totient is φ = 1309540680.

The previous prime is 1311330373. The next prime is 1311330407. The reversal of 1311330403 is 3040331131.

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 1311330403 - 2⁹ = 1311329891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311330407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893763 + ... + 895228.

It is an arithmetic number, because the mean of its divisors is an integer number (328280032).

Almost surely, 2^1311330403 is an apocalyptic number.

1311330403 is a deficient number, since it is larger than the sum of its proper divisors (1789725).

1311330403 is an equidigital number, since it uses as much as digits as its factorization.

1311330403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789724.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1311330403 is about 36212.2962955955. The cubic root of 1311330403 is about 1094.5544646721.

Adding to 1311330403 its reverse (3040331131), we get a palindrome (4351661534).

The spelling of 1311330403 in words is "one billion, three hundred eleven million, three hundred thirty thousand, four hundred three".