311923 has 4 divisors (see below), whose sum is σ = 328360. Its totient is φ = 295488.

The previous prime is 311897. The next prime is 311951. The reversal of 311923 is 329113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329113 = 397 ⋅829.

It is not a de Polignac number, because 311923 - 2¹³ = 303731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 16417 = 311923 / (3 + 1 + 1 + 9 + 2 + 3).

It is the 559-th Hogben number.

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 311923.

It is not an unprimeable number, because it can be changed into a prime (311963) by changing a digit.

It is a nontrivial repunit in base 558.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8190 + ... + 8227.

It is an arithmetic number, because the mean of its divisors is an integer number (82090).

2³¹¹⁹²³ is an apocalyptic number.

311923 is a deficient number, since it is larger than the sum of its proper divisors (16437).

311923 is a wasteful number, since it uses less digits than its factorization.

311923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16436.

The product of its digits is 162, while the sum is 19.

The square root of 311923 is about 558.5006714410. The cubic root of 311923 is about 67.8186488439.

The spelling of 311923 in words is "three hundred eleven thousand, nine hundred twenty-three".