2186661 has 8 divisors (see below), whose sum is σ = 2932384. Its totient is φ = 1449360.

The previous prime is 2186651. The next prime is 2186677. The reversal of 2186661 is 1666812.

2186661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2186661 - 2⁷ = 2186533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2186651) 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, 1471 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (366548).

2^2186661 is an apocalyptic number.

It is an amenable number.

2186661 is a deficient number, since it is larger than the sum of its proper divisors (745723).

2186661 is a wasteful number, since it uses less digits than its factorization.

2186661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its digits is 3456, while the sum is 30.

The square root of 2186661 is about 1478.7362848054. The cubic root of 2186661 is about 129.7957542238.

The spelling of 2186661 in words is "two million, one hundred eighty-six thousand, six hundred sixty-one".