2011999 has 8 divisors (see below), whose sum is σ = 2205648. Its totient is φ = 1820160.

The previous prime is 2011987. The next prime is 2012009. The reversal of 2011999 is 9991102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2011999 - 2¹⁹ = 1487711 is a prime.

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 2011999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3199 + ... + 3775.

It is an arithmetic number, because the mean of its divisors is an integer number (275706).

2^2011999 is an apocalyptic number.

2011999 is a deficient number, since it is larger than the sum of its proper divisors (193649).

2011999 is a wasteful number, since it uses less digits than its factorization.

2011999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 2011999 is about 1418.4495056222. The cubic root of 2011999 is about 126.2435659891.

The spelling of 2011999 in words is "two million, eleven thousand, nine hundred ninety-nine".