1668201 has 4 divisors (see below), whose sum is σ = 2224272. Its totient is φ = 1112132.

The previous prime is 1668197. The next prime is 1668211. The reversal of 1668201 is 1028661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668201 - 2² = 1668197 is a prime.

It is an Ulam number.

It is a D-number.

1668201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1668211) 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 in 3 ways as a sum of consecutive naturals, for example, 278031 + ... + 278036.

It is an arithmetic number, because the mean of its divisors is an integer number (556068).

2^1668201 is an apocalyptic number.

It is an amenable number.

1668201 is a deficient number, since it is larger than the sum of its proper divisors (556071).

1668201 is an equidigital number, since it uses as much as digits as its factorization.

1668201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556070.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1668201 is about 1291.5885567780. The cubic root of 1668201 is about 118.5994820570.

The spelling of 1668201 in words is "one million, six hundred sixty-eight thousand, two hundred one".