1668211 has 2 divisors, whose sum is σ = 1668212. Its totient is φ = 1668210.

The previous prime is 1668197. The next prime is 1668229. The reversal of 1668211 is 1128661.

It is a weak prime.

It is an emirp because it is prime and its reverse (1128661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668211 - 2⁷ = 1668083 is a prime.

It is a nialpdrome in base 6.

It is not a weakly prime, because it can be changed into another prime (1668241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834105 + 834106.

It is an arithmetic number, because the mean of its divisors is an integer number (834106).

2^1668211 is an apocalyptic number.

1668211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668211 is an equidigital number, since it uses as much as digits as its factorization.

1668211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 1668211 is about 1291.5924279741. The cubic root of 1668211 is about 118.5997190374.

The spelling of 1668211 in words is "one million, six hundred sixty-eight thousand, two hundred eleven".