2011591 has 2 divisors, whose sum is σ = 2011592. Its totient is φ = 2011590.

The previous prime is 2011573. The next prime is 2011601. The reversal of 2011591 is 1951102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011591 - 2¹¹ = 2009543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011531) 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 as a sum of consecutive naturals, namely, 1005795 + 1005796.

It is an arithmetic number, because the mean of its divisors is an integer number (1005796).

2^2011591 is an apocalyptic number.

2011591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011591 is an equidigital number, since it uses as much as digits as its factorization.

2011591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 2011591 is about 1418.3056793230. The cubic root of 2011591 is about 126.2350320457.

Adding to 2011591 its reverse (1951102), we get a palindrome (3962693).

It can be divided in two parts, 20 and 11591, that added together give a palindrome (11611).

The spelling of 2011591 in words is "two million, eleven thousand, five hundred ninety-one".