1311323203 has 16 divisors (see below), whose sum is σ = 1416843360. Its totient is φ = 1209102336.

The previous prime is 1311323197. The next prime is 1311323207. The reversal of 1311323203 is 3023231131.

It is a cyclic number.

It is not a de Polignac number, because 1311323203 - 2¹⁷ = 1311192131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311323207) 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 15 ways as a sum of consecutive naturals, for example, 311851 + ... + 316027.

It is an arithmetic number, because the mean of its divisors is an integer number (88552710).

Almost surely, 2^1311323203 is an apocalyptic number.

1311323203 is a deficient number, since it is larger than the sum of its proper divisors (105520157).

1311323203 is a wasteful number, since it uses less digits than its factorization.

1311323203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566.

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

The square root of 1311323203 is about 36212.1968817138. The cubic root of 1311323203 is about 1094.5524614122.

Adding to 1311323203 its reverse (3023231131), we get a palindrome (4334554334).

The spelling of 1311323203 in words is "one billion, three hundred eleven million, three hundred twenty-three thousand, two hundred three".