2001520409 has 4 divisors (see below), whose sum is σ = 2287451904. Its totient is φ = 1715588916.

The previous prime is 2001520403. The next prime is 2001520429. The reversal of 2001520409 is 9040251002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001520409 - 2⁴ = 2001520393 is a prime.

It is a super-3 number, since 3×2001520409³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001520403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142965737 + ... + 142965750.

It is an arithmetic number, because the mean of its divisors is an integer number (571862976).

Almost surely, 2^2001520409 is an apocalyptic number.

It is an amenable number.

2001520409 is a deficient number, since it is larger than the sum of its proper divisors (285931495).

2001520409 is an equidigital number, since it uses as much as digits as its factorization.

2001520409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285931494.

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

The square root of 2001520409 is about 44738.3550099911. The cubic root of 2001520409 is about 1260.2402349105.

The spelling of 2001520409 in words is "two billion, one million, five hundred twenty thousand, four hundred nine".