1664051 has 4 divisors (see below), whose sum is σ = 1666632. Its totient is φ = 1661472.

The previous prime is 1664021. The next prime is 1664053. The reversal of 1664051 is 1504661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1664051 - 2¹⁰ = 1663027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635 + ... + 1931.

It is an arithmetic number, because the mean of its divisors is an integer number (416658).

2^1664051 is an apocalyptic number.

1664051 is a deficient number, since it is larger than the sum of its proper divisors (2581).

1664051 is a wasteful number, since it uses less digits than its factorization.

1664051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1664051 is about 1289.9810076121. The cubic root of 1664051 is about 118.5010533593.

The spelling of 1664051 in words is "one million, six hundred sixty-four thousand, fifty-one".