311824013 has 4 divisors (see below), whose sum is σ = 330166620. Its totient is φ = 293481408.

The previous prime is 311823997. The next prime is 311824021. The reversal of 311824013 is 310428113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310428113 = 37 ⋅8389949.

It can be written as a sum of positive squares in 2 ways, for example, as 125037124 + 186786889 = 11182^2 + 13667^2 .

It is a cyclic number.

It is not a de Polignac number, because 311824013 - 2⁴ = 311823997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311824013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311824043) 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, 9171278 + ... + 9171311.

It is an arithmetic number, because the mean of its divisors is an integer number (82541655).

Almost surely, 2^311824013 is an apocalyptic number.

It is an amenable number.

311824013 is a deficient number, since it is larger than the sum of its proper divisors (18342607).

311824013 is a wasteful number, since it uses less digits than its factorization.

311824013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18342606.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 311824013 is about 17658.5393790087. The cubic root of 311824013 is about 678.1147413003.

The spelling of 311824013 in words is "three hundred eleven million, eight hundred twenty-four thousand, thirteen".