311330389 has 4 divisors (see below), whose sum is σ = 315271360. Its totient is φ = 307389420.

The previous prime is 311330387. The next prime is 311330407. The reversal of 311330389 is 983033113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983033113 = 641 ⋅1533593.

It is a cyclic number.

It is not a de Polignac number, because 311330389 - 2¹ = 311330387 is a prime.

It is a super-2 number, since 2×311330389² = 193853222229782642, which contains 22 as substring.

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 311330389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311330387) 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, 1970367 + ... + 1970524.

It is an arithmetic number, because the mean of its divisors is an integer number (78817840).

Almost surely, 2^311330389 is an apocalyptic number.

It is an amenable number.

311330389 is a deficient number, since it is larger than the sum of its proper divisors (3940971).

311330389 is an equidigital number, since it uses as much as digits as its factorization.

311330389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940970.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 311330389 is about 17644.5569227453. The cubic root of 311330389 is about 677.7567289998.

The spelling of 311330389 in words is "three hundred eleven million, three hundred thirty thousand, three hundred eighty-nine".