2001573 has 12 divisors (see below), whose sum is σ = 3304288. Its totient is φ = 1143720.

The previous prime is 2001553. The next prime is 2001581. The reversal of 2001573 is 3751002.

It is not a de Polignac number, because 2001573 - 2⁵ = 2001541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001533) 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 11 ways as a sum of consecutive naturals, for example, 15823 + ... + 15948.

2^2001573 is an apocalyptic number.

It is an amenable number.

2001573 is a deficient number, since it is larger than the sum of its proper divisors (1302715).

2001573 is a wasteful number, since it uses less digits than its factorization.

2001573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31784 (or 31781 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 2001573 is about 1414.7695925486. The cubic root of 2001573 is about 126.0251272639.

Adding to 2001573 its reverse (3751002), we get a palindrome (5752575).

The spelling of 2001573 in words is "two million, one thousand, five hundred seventy-three".