2017561 has 8 divisors (see below), whose sum is σ = 2483264. Its totient is φ = 1596240.

The previous prime is 2017549. The next prime is 2017567. The reversal of 2017561 is 1657102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2017561 - 2⁵ = 2017529 is a prime.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2017567) 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 7 ways as a sum of consecutive naturals, for example, 10995 + ... + 11176.

It is an arithmetic number, because the mean of its divisors is an integer number (310408).

2^2017561 is an apocalyptic number.

It is an amenable number.

2017561 is a deficient number, since it is larger than the sum of its proper divisors (465703).

2017561 is a wasteful number, since it uses less digits than its factorization.

2017561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22191.

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

The square root of 2017561 is about 1420.4087439889. The cubic root of 2017561 is about 126.3597888234.

The spelling of 2017561 in words is "two million, seventeen thousand, five hundred sixty-one".