1668571 has 6 divisors (see below), whose sum is σ = 1697516. Its totient is φ = 1640100.

The previous prime is 1668553. The next prime is 1668587. The reversal of 1668571 is 1758661.

It is not a de Polignac number, because 1668571 - 2⁵ = 1668539 is a prime.

It is a Duffinian number.

1668571 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1668521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4876 + ... + 5206.

2^1668571 is an apocalyptic number.

1668571 is a deficient number, since it is larger than the sum of its proper divisors (28945).

1668571 is an frugal number, since it uses more digits than its factorization.

1668571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 402 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 1668571 is about 1291.7317833049. The cubic root of 1668571 is about 118.6082496984.

The spelling of 1668571 in words is "one million, six hundred sixty-eight thousand, five hundred seventy-one".