2005515521 has 16 divisors (see below), whose sum is σ = 2142388224. Its totient is φ = 1872981264.

The previous prime is 2005515509. The next prime is 2005515529. The reversal of 2005515521 is 1255155002.

It is a de Polignac number, because none of the positive numbers 2^k-2005515521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005515529) 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, 498500 + ... + 502506.

It is an arithmetic number, because the mean of its divisors is an integer number (133899264).

Almost surely, 2^2005515521 is an apocalyptic number.

It is an amenable number.

2005515521 is a deficient number, since it is larger than the sum of its proper divisors (136872703).

2005515521 is a wasteful number, since it uses less digits than its factorization.

2005515521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 2005515521 is about 44782.9824933534. The cubic root of 2005515521 is about 1261.0781736906.

The spelling of 2005515521 in words is "two billion, five million, five hundred fifteen thousand, five hundred twenty-one".