311243313 has 16 divisors (see below), whose sum is σ = 440032320. Its totient is φ = 195134976.

The previous prime is 311243281. The next prime is 311243321. The reversal of 311243313 is 313342113.

It is not a de Polignac number, because 311243313 - 2⁵ = 311243281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311243313.

It is not an unprimeable number, because it can be changed into a prime (311243323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12120 + ... + 27737.

It is an arithmetic number, because the mean of its divisors is an integer number (27502020).

Almost surely, 2^311243313 is an apocalyptic number.

It is an amenable number.

311243313 is a deficient number, since it is larger than the sum of its proper divisors (128789007).

311243313 is a wasteful number, since it uses less digits than its factorization.

311243313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40016.

The product of its digits is 648, while the sum is 21.

The square root of 311243313 is about 17642.0892470251. The cubic root of 311243313 is about 677.6935358456.

Adding to 311243313 its reverse (313342113), we get a palindrome (624585426).

The spelling of 311243313 in words is "three hundred eleven million, two hundred forty-three thousand, three hundred thirteen".