521000649 has 48 divisors (see below), whose sum is σ = 863920512. Its totient is φ = 299718144.

The previous prime is 521000617. The next prime is 521000657. The reversal of 521000649 is 946000125.

521000649 is a `hidden beast` number, since 5 + 2 + 10 + 0 + 0 + 649 = 666.

It is not a de Polignac number, because 521000649 - 2⁵ = 521000617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521000699) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 323404 + ... + 325010.

It is an arithmetic number, because the mean of its divisors is an integer number (17998344).

Almost surely, 2^521000649 is an apocalyptic number.

It is an amenable number.

521000649 is a deficient number, since it is larger than the sum of its proper divisors (342919863).

521000649 is a wasteful number, since it uses less digits than its factorization.

521000649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 521000649 is about 22825.4386376253. The cubic root of 521000649 is about 804.6606334140.

The spelling of 521000649 in words is "five hundred twenty-one million, six hundred forty-nine", and thus it is an aban number.