2011009 has 32 divisors (see below), whose sum is σ = 2822400. Its totient is φ = 1411200.

The previous prime is 2011003. The next prime is 2011019. The reversal of 2011009 is 9001102.

It is not a de Polignac number, because 2011009 - 2⁵ = 2010977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

2011009 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49029 + ... + 49069.

It is an arithmetic number, because the mean of its divisors is an integer number (88200).

2^2011009 is an apocalyptic number.

It is an amenable number.

2011009 is a deficient number, since it is larger than the sum of its proper divisors (811391).

2011009 is a wasteful number, since it uses less digits than its factorization.

2011009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2011009 is about 1418.1004900923. The cubic root of 2011009 is about 126.2228566291. Note that the first 3 decimals are identical.

The spelling of 2011009 in words is "two million, eleven thousand, nine".