311889 has 4 divisors (see below), whose sum is σ = 415856. Its totient is φ = 207924.

The previous prime is 311881. The next prime is 311897. The reversal of 311889 is 988113.

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.

It is an interprime number because it is at equal distance from previous prime (311881) and next prime (311897).

It is not a de Polignac number, because 311889 - 2³ = 311881 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51979 + ... + 51984.

It is an arithmetic number, because the mean of its divisors is an integer number (103964).

2³¹¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

311889 is a deficient number, since it is larger than the sum of its proper divisors (103967).

311889 is a wasteful number, since it uses less digits than its factorization.

311889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103966.

The product of its digits is 1728, while the sum is 30.

The square root of 311889 is about 558.4702319730. The cubic root of 311889 is about 67.8161846483.

The spelling of 311889 in words is "three hundred eleven thousand, eight hundred eighty-nine".