311911 has 4 divisors (see below), whose sum is σ = 314424. Its totient is φ = 309400.

The previous prime is 311897. The next prime is 311951. The reversal of 311911 is 119113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119113 = 311 ⋅383.

It is a cyclic number.

It is not a de Polignac number, because 311911 - 2¹⁵ = 279143 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 (311951) 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, 1060 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (78606).

2³¹¹⁹¹¹ is an apocalyptic number.

311911 is a deficient number, since it is larger than the sum of its proper divisors (2513).

311911 is a wasteful number, since it uses less digits than its factorization.

311911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512.

The product of its digits is 27, while the sum is 16.

The square root of 311911 is about 558.4899282888. The cubic root of 311911 is about 67.8177791483.

The spelling of 311911 in words is "three hundred eleven thousand, nine hundred eleven".