521085128 has 16 divisors (see below), whose sum is σ = 977317260. Its totient is φ = 260467200.

The previous prime is 521085101. The next prime is 521085133. The reversal of 521085128 is 821580125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 413796964 + 107288164 = 20342^2 + 10358^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521085094 and 521085103.

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 3 ways as a sum of consecutive naturals, for example, 29348 + ... + 43628.

Almost surely, 2^521085128 is an apocalyptic number.

It is an amenable number.

521085128 is a deficient number, since it is larger than the sum of its proper divisors (456232132).

521085128 is a wasteful number, since it uses less digits than its factorization.

521085128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18848 (or 18844 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 521085128 is about 22827.2891075572. The cubic root of 521085128 is about 804.7041223246.

The spelling of 521085128 in words is "five hundred twenty-one million, eighty-five thousand, one hundred twenty-eight".