1668001 has 2 divisors, whose sum is σ = 1668002. Its totient is φ = 1668000.

The previous prime is 1667969. The next prime is 1668011. The reversal of 1668001 is 1008661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1437601 + 230400 = 1199^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668001 - 2⁵ = 1667969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668011) 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, 834000 + 834001.

It is an arithmetic number, because the mean of its divisors is an integer number (834001).

2^1668001 is an apocalyptic number.

It is an amenable number.

1668001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668001 is an equidigital number, since it uses as much as digits as its factorization.

1668001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1668001 is about 1291.5111304205. The cubic root of 1668001 is about 118.5947422516.

The spelling of 1668001 in words is "one million, six hundred sixty-eight thousand, one".