311338891 has 4 divisors (see below), whose sum is σ = 311742432. Its totient is φ = 310935352.

The previous prime is 311338889. The next prime is 311338903. The reversal of 311338891 is 198833113.

It is a happy number.

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 311338891 - 2¹ = 311338889 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 311338891.

It is not an unprimeable number, because it can be changed into a prime (311338861) 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, 200611 + ... + 202156.

It is an arithmetic number, because the mean of its divisors is an integer number (77935608).

Almost surely, 2^311338891 is an apocalyptic number.

311338891 is a deficient number, since it is larger than the sum of its proper divisors (403541).

311338891 is an equidigital number, since it uses as much as digits as its factorization.

311338891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403540.

The product of its digits is 15552, while the sum is 37.

The square root of 311338891 is about 17644.7978452574. The cubic root of 311338891 is about 677.7628984750.

The spelling of 311338891 in words is "three hundred eleven million, three hundred thirty-eight thousand, eight hundred ninety-one".