311855 has 8 divisors (see below), whose sum is σ = 378672. Its totient is φ = 246528.

The previous prime is 311827. The next prime is 311867. The reversal of 311855 is 558113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311855 - 2⁶ = 311791 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 311855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164 + ... + 806.

It is an arithmetic number, because the mean of its divisors is an integer number (47334).

2³¹¹⁸⁵⁵ is an apocalyptic number.

311855 is a deficient number, since it is larger than the sum of its proper divisors (66817).

311855 is an equidigital number, since it uses as much as digits as its factorization.

311855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its digits is 600, while the sum is 23.

The square root of 311855 is about 558.4397908459. The cubic root of 311855 is about 67.8137202737.

Adding to 311855 its reverse (558113), we get a palindrome (869968).

The spelling of 311855 in words is "three hundred eleven thousand, eight hundred fifty-five".