2561611 has 16 divisors (see below), whose sum is σ = 2981664. Its totient is φ = 2179584.

The previous prime is 2561593. The next prime is 2561627. The reversal of 2561611 is 1161652.

2561611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2561611 - 2⁹ = 2561099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2561651) 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 15 ways as a sum of consecutive naturals, for example, 14721 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (186354).

2^2561611 is an apocalyptic number.

2561611 is a deficient number, since it is larger than the sum of its proper divisors (420053).

2561611 is a wasteful number, since it uses less digits than its factorization.

2561611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 360, while the sum is 22.

The square root of 2561611 is about 1600.5033583220. The cubic root of 2561611 is about 136.8267652508.

The spelling of 2561611 in words is "two million, five hundred sixty-one thousand, six hundred eleven".