311979 has 4 divisors (see below), whose sum is σ = 415976. Its totient is φ = 207984.

The previous prime is 311963. The next prime is 311981. The reversal of 311979 is 979113.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 311979 - 2⁴ = 311963 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 (311279) 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, 51994 + ... + 51999.

It is an arithmetic number, because the mean of its divisors is an integer number (103994).

2³¹¹⁹⁷⁹ is an apocalyptic number.

311979 is a deficient number, since it is larger than the sum of its proper divisors (103997).

311979 is a wasteful number, since it uses less digits than its factorization.

311979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103996.

The product of its digits is 1701, while the sum is 30.

The square root of 311979 is about 558.5508034190. The cubic root of 311979 is about 67.8227071287.

It can be divided in two parts, 3 and 11979, that multiplied together give a cube (35937 = 33³).

The spelling of 311979 in words is "three hundred eleven thousand, nine hundred seventy-nine".