1664031 has 4 divisors (see below), whose sum is σ = 2218712. Its totient is φ = 1109352.

The previous prime is 1664021. The next prime is 1664053. The reversal of 1664031 is 1304661.

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

It is not a de Polignac number, because 1664031 - 2⁶ = 1663967 is a prime.

It is a super-2 number, since 2×1664031² = 5537998337922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663989 and 1664007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664021) 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, 277336 + ... + 277341.

It is an arithmetic number, because the mean of its divisors is an integer number (554678).

2^1664031 is an apocalyptic number.

1664031 is a deficient number, since it is larger than the sum of its proper divisors (554681).

1664031 is an equidigital number, since it uses as much as digits as its factorization.

1664031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554680.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1664031 is about 1289.9732555367. The cubic root of 1664031 is about 118.5005786082.

Adding to 1664031 its reverse (1304661), we get a palindrome (2968692).

The spelling of 1664031 in words is "one million, six hundred sixty-four thousand, thirty-one".