5205635521 has 4 divisors (see below), whose sum is σ = 5206039344. Its totient is φ = 5205231700.

The previous prime is 5205635453. The next prime is 5205635527. The reversal of 5205635521 is 1255365025.

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 a de Polignac number, because none of the positive numbers 2^k-5205635521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5205635527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181915 + ... + 208576.

It is an arithmetic number, because the mean of its divisors is an integer number (1301509836).

Almost surely, 2^5205635521 is an apocalyptic number.

It is an amenable number.

5205635521 is a deficient number, since it is larger than the sum of its proper divisors (403823).

5205635521 is a wasteful number, since it uses less digits than its factorization.

5205635521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403822.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 5205635521 is about 72150.0902355638. The cubic root of 5205635521 is about 1733.1038448108.

The spelling of 5205635521 in words is "five billion, two hundred five million, six hundred thirty-five thousand, five hundred twenty-one".