311943 has 4 divisors (see below), whose sum is σ = 415928. Its totient is φ = 207960.

The previous prime is 311897. The next prime is 311951. The reversal of 311943 is 349113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349113 = 3 ⋅116371.

It is not a de Polignac number, because 311943 - 2⁸ = 311687 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311963) 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, 51988 + ... + 51993.

It is an arithmetic number, because the mean of its divisors is an integer number (103982).

2³¹¹⁹⁴³ is an apocalyptic number.

311943 is a deficient number, since it is larger than the sum of its proper divisors (103985).

311943 is a wasteful number, since it uses less digits than its factorization.

311943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103984.

The product of its digits is 324, while the sum is 21.

The square root of 311943 is about 558.5185762354. The cubic root of 311943 is about 67.8200982871.

The spelling of 311943 in words is "three hundred eleven thousand, nine hundred forty-three".