2166061 has 4 divisors (see below), whose sum is σ = 2173212. Its totient is φ = 2158912.

The previous prime is 2166053. The next prime is 2166077. The reversal of 2166061 is 1606612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189225 + 1976836 = 435^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166061 - 2³ = 2166053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100 + ... + 3733.

It is an arithmetic number, because the mean of its divisors is an integer number (543303).

2^2166061 is an apocalyptic number.

It is an amenable number.

2166061 is a deficient number, since it is larger than the sum of its proper divisors (7151).

2166061 is an equidigital number, since it uses as much as digits as its factorization.

2166061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2166061 is about 1471.7543952712. The cubic root of 2166061 is about 129.3868761609.

The spelling of 2166061 in words is "two million, one hundred sixty-six thousand, sixty-one".