2108561 has 32 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 1483776.

The previous prime is 2108551. The next prime is 2108597. The reversal of 2108561 is 1658012.

It is not a de Polignac number, because 2108561 - 2⁶ = 2108497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2108501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44840 + ... + 44886.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^2108561 is an apocalyptic number.

It is an amenable number.

2108561 is a deficient number, since it is larger than the sum of its proper divisors (794479).

2108561 is a wasteful number, since it uses less digits than its factorization.

2108561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2108561 is about 1452.0884959258. The cubic root of 2108561 is about 128.2316970437.

The spelling of 2108561 in words is "two million, one hundred eight thousand, five hundred sixty-one".