2166919 has 2 divisors, whose sum is σ = 2166920. Its totient is φ = 2166918.

The previous prime is 2166917. The next prime is 2166937. The reversal of 2166919 is 9196612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166919 - 2¹ = 2166917 is a prime.

It is a super-2 number, since 2×2166919² = 9391075905122, which contains 22 as substring.

Together with 2166917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166917) 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 as a sum of consecutive naturals, namely, 1083459 + 1083460.

It is an arithmetic number, because the mean of its divisors is an integer number (1083460).

2^2166919 is an apocalyptic number.

2166919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166919 is an equidigital number, since it uses as much as digits as its factorization.

2166919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 2166919 is about 1472.0458552640. The cubic root of 2166919 is about 129.4039577489.

The spelling of 2166919 in words is "two million, one hundred sixty-six thousand, nine hundred nineteen".