2166813 has 24 divisors (see below), whose sum is σ = 3500640. Its totient is φ = 1280160.

The previous prime is 2166797. The next prime is 2166821. The reversal of 2166813 is 3186612.

It is not a de Polignac number, because 2166813 - 2⁴ = 2166797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4003 + ... + 4511.

It is an arithmetic number, because the mean of its divisors is an integer number (145860).

2^2166813 is an apocalyptic number.

It is an amenable number.

2166813 is a deficient number, since it is larger than the sum of its proper divisors (1333827).

2166813 is a wasteful number, since it uses less digits than its factorization.

2166813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 566 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 2166813 is about 1472.0098505105. The cubic root of 2166813 is about 129.4018476803.

The spelling of 2166813 in words is "two million, one hundred sixty-six thousand, eight hundred thirteen".