2166679 has 2 divisors, whose sum is σ = 2166680. Its totient is φ = 2166678.

The previous prime is 2166673. The next prime is 2166691. The reversal of 2166679 is 9766612.

2166679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166679 - 2⁹ = 2166167 is a prime.

2166679 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166673) 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 as a sum of consecutive naturals, namely, 1083339 + 1083340.

It is an arithmetic number, because the mean of its divisors is an integer number (1083340).

2^2166679 is an apocalyptic number.

2166679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166679 is an equidigital number, since it uses as much as digits as its factorization.

2166679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 2166679 is about 1471.9643338070. The cubic root of 2166679 is about 129.3991801367.

The spelling of 2166679 in words is "two million, one hundred sixty-six thousand, six hundred seventy-nine".