521539985 has 8 divisors (see below), whose sum is σ = 631924800. Its totient is φ = 413180784.

The previous prime is 521539961. The next prime is 521540003. The reversal of 521539985 is 589935125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521539985 - 2⁸ = 521539729 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505835 + ... + 506864.

It is an arithmetic number, because the mean of its divisors is an integer number (78990600).

Almost surely, 2^521539985 is an apocalyptic number.

It is an amenable number.

521539985 is a deficient number, since it is larger than the sum of its proper divisors (110384815).

521539985 is a wasteful number, since it uses less digits than its factorization.

521539985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012807.

The product of its digits is 486000, while the sum is 47.

The square root of 521539985 is about 22837.2499438965. The cubic root of 521539985 is about 804.9381972280.

The spelling of 521539985 in words is "five hundred twenty-one million, five hundred thirty-nine thousand, nine hundred eighty-five".