2311999 has 4 divisors (see below), whose sum is σ = 2333320. Its totient is φ = 2290680.

The previous prime is 2311993. The next prime is 2312021. The reversal of 2311999 is 9991132.

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

It is a cyclic number.

It is not a de Polignac number, because 2311999 - 2⁹ = 2311487 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 (2311993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10497 + ... + 10714.

It is an arithmetic number, because the mean of its divisors is an integer number (583330).

2^2311999 is an apocalyptic number.

2311999 is a deficient number, since it is larger than the sum of its proper divisors (21321).

2311999 is a wasteful number, since it uses less digits than its factorization.

2311999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21320.

The product of its digits is 4374, while the sum is 34.

The square root of 2311999 is about 1520.5258958663. The cubic root of 2311999 is about 132.2297613049.

The spelling of 2311999 in words is "two million, three hundred eleven thousand, nine hundred ninety-nine".