520551621 has 12 divisors (see below), whose sum is σ = 770247660. Its totient is φ = 338569920.

The previous prime is 520551601. The next prime is 520551673. The reversal of 520551621 is 126155025.

520551621 is a `hidden beast` number, since 52 + 0 + 551 + 62 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 187306596 + 333245025 = 13686^2 + 18255^2 .

It is not a de Polignac number, because 520551621 - 2¹⁸ = 520289477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520551601) 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 11 ways as a sum of consecutive naturals, for example, 704986 + ... + 705723.

It is an arithmetic number, because the mean of its divisors is an integer number (64187305).

Almost surely, 2^520551621 is an apocalyptic number.

It is an amenable number.

520551621 is a deficient number, since it is larger than the sum of its proper divisors (249696039).

520551621 is a wasteful number, since it uses less digits than its factorization.

520551621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410756 (or 1410753 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 520551621 is about 22815.6003865776. The cubic root of 520551621 is about 804.4293995336.

The spelling of 520551621 in words is "five hundred twenty million, five hundred fifty-one thousand, six hundred twenty-one".