311939 has 4 divisors (see below), whose sum is σ = 318624. Its totient is φ = 305256.

The previous prime is 311897. The next prime is 311951. The reversal of 311939 is 939113.

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 311939 - 2⁸ = 311683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311539) 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, 3272 + ... + 3365.

It is an arithmetic number, because the mean of its divisors is an integer number (79656).

2³¹¹⁹³⁹ is an apocalyptic number.

311939 is a deficient number, since it is larger than the sum of its proper divisors (6685).

311939 is an equidigital number, since it uses as much as digits as its factorization.

311939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684.

The product of its digits is 729, while the sum is 26.

The square root of 311939 is about 558.5149953224. The cubic root of 311939 is about 67.8198084034.

The spelling of 311939 in words is "three hundred eleven thousand, nine hundred thirty-nine".