311312203313 has 4 divisors (see below), whose sum is σ = 313584555300. Its totient is φ = 309039851328.

The previous prime is 311312203289. The next prime is 311312203339. The reversal of 311312203313 is 313302213113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 268068169009 + 43244034304 = 517753^2 + 207952^2 .

It is a cyclic number.

It is not a de Polignac number, because 311312203313 - 2⁸ = 311312203057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (311312203373) 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, 1136175788 + ... + 1136176061.

It is an arithmetic number, because the mean of its divisors is an integer number (78396138825).

Almost surely, 2^311312203313 is an apocalyptic number.

It is an amenable number.

311312203313 is a deficient number, since it is larger than the sum of its proper divisors (2272351987).

311312203313 is a wasteful number, since it uses less digits than its factorization.

311312203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272351986.

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

Adding to 311312203313 its reverse (313302213113), we get a palindrome (624614416426).

The spelling of 311312203313 in words is "three hundred eleven billion, three hundred twelve million, two hundred three thousand, three hundred thirteen".