2011605 has 16 divisors (see below), whose sum is σ = 3274560. Its totient is φ = 1054208.

The previous prime is 2011601. The next prime is 2011613. The reversal of 2011605 is 5061102.

2011605 = 444² + 445² + ... + 453².

It is a cyclic number.

It is not a de Polignac number, because 2011605 - 2² = 2011601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011601) 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 15 ways as a sum of consecutive naturals, for example, 252 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (204660).

2^2011605 is an apocalyptic number.

It is an amenable number.

2011605 is a deficient number, since it is larger than the sum of its proper divisors (1262955).

2011605 is a wasteful number, since it uses less digits than its factorization.

2011605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2011605 is about 1418.3106147808. The cubic root of 2011605 is about 126.2353248962.

Adding to 2011605 its reverse (5061102), we get a palindrome (7072707).

The spelling of 2011605 in words is "two million, eleven thousand, six hundred five".