521205085 has 4 divisors (see below), whose sum is σ = 625446108. Its totient is φ = 416964064.

The previous prime is 521205073. The next prime is 521205109. The reversal of 521205085 is 580502125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201725209 + 319479876 = 14203^2 + 17874^2 .

It is a cyclic number.

It is not a de Polignac number, because 521205085 - 2⁵ = 521205053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 52120504 + ... + 52120513.

It is an arithmetic number, because the mean of its divisors is an integer number (156361527).

Almost surely, 2^521205085 is an apocalyptic number.

It is an amenable number.

521205085 is a deficient number, since it is larger than the sum of its proper divisors (104241023).

521205085 is a wasteful number, since it uses less digits than its factorization.

521205085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104241022.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 521205085 is about 22829.9164475037. The cubic root of 521205085 is about 804.7658668655.

The spelling of 521205085 in words is "five hundred twenty-one million, two hundred five thousand, eighty-five".