2001521 has 8 divisors (see below), whose sum is σ = 2075040. Its totient is φ = 1929312.

The previous prime is 2001511. The next prime is 2001533. The reversal of 2001521 is 1251002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001521 - 2¹⁰ = 2000497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001511) 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 7 ways as a sum of consecutive naturals, for example, 3566 + ... + 4088.

It is an arithmetic number, because the mean of its divisors is an integer number (259380).

2^2001521 is an apocalyptic number.

It is an amenable number.

2001521 is a deficient number, since it is larger than the sum of its proper divisors (73519).

2001521 is an equidigital number, since it uses as much as digits as its factorization.

2001521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2001521 is about 1414.7512148784. The cubic root of 2001521 is about 126.0240358950.

Adding to 2001521 its reverse (1251002), we get a palindrome (3252523).

The spelling of 2001521 in words is "two million, one thousand, five hundred twenty-one".