1664211 has 16 divisors (see below), whose sum is σ = 2350080. Its totient is φ = 1045440.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664211 is 1124661.

1664211 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 1664211 - 2⁷ = 1664083 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1664251) 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 15 ways as a sum of consecutive naturals, for example, 6006 + ... + 6276.

It is an arithmetic number, because the mean of its divisors is an integer number (146880).

2^1664211 is an apocalyptic number.

1664211 is a deficient number, since it is larger than the sum of its proper divisors (685869).

1664211 is a wasteful number, since it uses less digits than its factorization.

1664211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386.

The product of its digits is 288, while the sum is 21.

The square root of 1664211 is about 1290.0430225384. The cubic root of 1664211 is about 118.5048512319.

Adding to 1664211 its reverse (1124661), we get a palindrome (2788872).

It can be divided in two parts, 16642 and 11, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 1664211 in words is "one million, six hundred sixty-four thousand, two hundred eleven".