2011639 has 8 divisors (see below), whose sum is σ = 2312480. Its totient is φ = 1714176.

The previous prime is 2011637. The next prime is 2011657. The reversal of 2011639 is 9361102.

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 2011639 - 2¹ = 2011637 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 (2011631) 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, 607 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (289060).

2^2011639 is an apocalyptic number.

2011639 is a deficient number, since it is larger than the sum of its proper divisors (300841).

2011639 is a wasteful number, since it uses less digits than its factorization.

2011639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2011639 is about 1418.3226008211. The cubic root of 2011639 is about 126.2360360989.

The spelling of 2011639 in words is "two million, eleven thousand, six hundred thirty-nine".