2107561 has 4 divisors (see below), whose sum is σ = 2111824. Its totient is φ = 2103300.

The previous prime is 2107543. The next prime is 2107601. The reversal of 2107561 is 1657012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2107561 - 2⁵ = 2107529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2107531) 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 3 ways as a sum of consecutive naturals, for example, 1275 + ... + 2416.

It is an arithmetic number, because the mean of its divisors is an integer number (527956).

2^2107561 is an apocalyptic number.

It is an amenable number.

2107561 is a deficient number, since it is larger than the sum of its proper divisors (4263).

2107561 is an equidigital number, since it uses as much as digits as its factorization.

2107561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 2107561 is about 1451.7441234598. The cubic root of 2107561 is about 128.2114222411.

The spelling of 2107561 in words is "two million, one hundred seven thousand, five hundred sixty-one".