311983 has 6 divisors (see below), whose sum is σ = 362976. Its totient is φ = 267372.

The previous prime is 311981. The next prime is 312007. The reversal of 311983 is 389113.

It is not a de Polignac number, because 311983 - 2¹ = 311981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3135 + ... + 3232.

It is an arithmetic number, because the mean of its divisors is an integer number (60496).

2³¹¹⁹⁸³ is an apocalyptic number.

311983 is a deficient number, since it is larger than the sum of its proper divisors (50993).

311983 is an equidigital number, since it uses as much as digits as its factorization.

311983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6381 (or 6374 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 311983 is about 558.5543841024. The cubic root of 311983 is about 67.8229969876.

The spelling of 311983 in words is "three hundred eleven thousand, nine hundred eighty-three".