311231313203 has 4 divisors (see below), whose sum is σ = 311396074920. Its totient is φ = 311066551488.

The previous prime is 311231313193. The next prime is 311231313209. The reversal of 311231313203 is 302313132113.

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 311231313203 - 2²⁰ = 311230264627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311231313209) 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, 82378025 + ... + 82381802.

It is an arithmetic number, because the mean of its divisors is an integer number (77849018730).

Almost surely, 2^311231313203 is an apocalyptic number.

311231313203 is a deficient number, since it is larger than the sum of its proper divisors (164761717).

311231313203 is a wasteful number, since it uses less digits than its factorization.

311231313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164761716.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 311231313203 its reverse (302313132113), we get a palindrome (613544445316).

The spelling of 311231313203 in words is "three hundred eleven billion, two hundred thirty-one million, three hundred thirteen thousand, two hundred three".