521681072 has 20 divisors (see below), whose sum is σ = 1102644456. Its totient is φ = 237127680.

The previous prime is 521681053. The next prime is 521681077. The reversal of 521681072 is 270186125.

It is a super-2 number, since 2×521681072² = 544302281766138368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521681077) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1481873 + ... + 1482224.

Almost surely, 2^521681072 is an apocalyptic number.

It is an amenable number.

521681072 is an abundant number, since it is smaller than the sum of its proper divisors (580963384).

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

521681072 is a wasteful number, since it uses less digits than its factorization.

521681072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964116 (or 2964110 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 521681072 is about 22840.3387015167. The cubic root of 521681072 is about 805.0107746459.

The spelling of 521681072 in words is "five hundred twenty-one million, six hundred eighty-one thousand, seventy-two".