2185561 has 16 divisors (see below), whose sum is σ = 2623104. Its totient is φ = 1782144.

The previous prime is 2185541. The next prime is 2185567. The reversal of 2185561 is 1655812.

It is not a de Polignac number, because 2185561 - 2⁷ = 2185433 is a prime.

It is a Duffinian number.

2185561 is a Rhonda number in base 10.

Its product of digits (2400) is a multiple of the sum of its prime divisors (240).

It is not an unprimeable number, because it can be changed into a prime (2185567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15885 + ... + 16021.

It is an arithmetic number, because the mean of its divisors is an integer number (163944).

2^2185561 is an apocalyptic number.

It is an amenable number.

2185561 is a deficient number, since it is larger than the sum of its proper divisors (437543).

2185561 is a wasteful number, since it uses less digits than its factorization.

2185561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its digits is 2400, while the sum is 28.

The square root of 2185561 is about 1478.3642988114. The cubic root of 2185561 is about 129.7739859849.

The spelling of 2185561 in words is "two million, one hundred eighty-five thousand, five hundred sixty-one".