2005520509 has 16 divisors (see below), whose sum is σ = 2175338880. Its totient is φ = 1842471360.

The previous prime is 2005520467. The next prime is 2005520521. The reversal of 2005520509 is 9050255002.

It is a cyclic number.

It is not a de Polignac number, because 2005520509 - 2²⁵ = 1971966077 is a prime.

It is a super-2 number, since 2×2005520509² = 8044225024039238162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005520009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214047 + ... + 223219.

It is an arithmetic number, because the mean of its divisors is an integer number (135958680).

Almost surely, 2^2005520509 is an apocalyptic number.

It is an amenable number.

2005520509 is a deficient number, since it is larger than the sum of its proper divisors (169818371).

2005520509 is a wasteful number, since it uses less digits than its factorization.

2005520509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 2005520509 is about 44783.0381841161. The cubic root of 2005520509 is about 1261.0792191828.

The spelling of 2005520509 in words is "two billion, five million, five hundred twenty thousand, five hundred nine".