1664911 has 4 divisors (see below), whose sum is σ = 1687792. Its totient is φ = 1642032.

The previous prime is 1664909. The next prime is 1664941. The reversal of 1664911 is 1194661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664911 - 2¹ = 1664909 is a prime.

It is a Duffinian number.

1664911 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11331 + ... + 11476.

It is an arithmetic number, because the mean of its divisors is an integer number (421948).

2^1664911 is an apocalyptic number.

1664911 is a deficient number, since it is larger than the sum of its proper divisors (22881).

1664911 is an equidigital number, since it uses as much as digits as its factorization.

1664911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880.

The product of its digits is 1296, while the sum is 28.

The square root of 1664911 is about 1290.3143027960. The cubic root of 1664911 is about 118.5214640628.

The spelling of 1664911 in words is "one million, six hundred sixty-four thousand, nine hundred eleven".