2011909 has 4 divisors (see below), whose sum is σ = 2024416. Its totient is φ = 1999404.

The previous prime is 2011907. The next prime is 2011913. The reversal of 2011909 is 9091102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9091102 = 2 ⋅4545551.

It is a cyclic number.

It is not a de Polignac number, because 2011909 - 2¹ = 2011907 is a prime.

It is a Duffinian number.

2011909 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6009 + ... + 6334.

It is an arithmetic number, because the mean of its divisors is an integer number (506104).

2^2011909 is an apocalyptic number.

It is an amenable number.

2011909 is a deficient number, since it is larger than the sum of its proper divisors (12507).

2011909 is a wasteful number, since it uses less digits than its factorization.

2011909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12506.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 2011909 is about 1418.4177804864. The cubic root of 2011909 is about 126.2416836008.

The spelling of 2011909 in words is "two million, eleven thousand, nine hundred nine".