521539986 has 32 divisors (see below), whose sum is σ = 1144507968. Its totient is φ = 157125440.

The previous prime is 521539961. The next prime is 521540003. The reversal of 521539986 is 689935125.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 11421 + ... + 34256.

It is an arithmetic number, because the mean of its divisors is an integer number (35765874).

Almost surely, 2^521539986 is an apocalyptic number.

521539986 is an abundant number, since it is smaller than the sum of its proper divisors (622967982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521539986 is a wasteful number, since it uses less digits than its factorization.

521539986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45866.

The product of its digits is 583200, while the sum is 48.

The square root of 521539986 is about 22837.2499657905. The cubic root of 521539986 is about 804.9381977424.

The spelling of 521539986 in words is "five hundred twenty-one million, five hundred thirty-nine thousand, nine hundred eighty-six".