1311312203 has 4 divisors (see below), whose sum is σ = 1312487280. Its totient is φ = 1310137128.

The previous prime is 1311312193. The next prime is 1311312209. The reversal of 1311312203 is 3022131131.

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 1311312203 - 2⁶ = 1311312139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311312209) 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, 585863 + ... + 588096.

It is an arithmetic number, because the mean of its divisors is an integer number (328121820).

Almost surely, 2^1311312203 is an apocalyptic number.

1311312203 is a deficient number, since it is larger than the sum of its proper divisors (1175077).

1311312203 is a wasteful number, since it uses less digits than its factorization.

1311312203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175076.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1311312203 is about 36212.0449988674. The cubic root of 1311312203 is about 1094.5494008622.

Adding to 1311312203 its reverse (3022131131), we get a palindrome (4333443334).

The spelling of 1311312203 in words is "one billion, three hundred eleven million, three hundred twelve thousand, two hundred three".