520867521 has 12 divisors (see below), whose sum is σ = 778308180. Its totient is φ = 335270880.

The previous prime is 520867507. The next prime is 520867531. The reversal of 520867521 is 125768025.

It is a happy number.

520867521 is a `hidden beast` number, since 52 + 0 + 86 + 7 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 179024400 + 341843121 = 13380^2 + 18489^2 .

It is not a de Polignac number, because 520867521 - 2⁷ = 520867393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520867531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 997570 + ... + 998091.

It is an arithmetic number, because the mean of its divisors is an integer number (64859015).

Almost surely, 2^520867521 is an apocalyptic number.

It is an amenable number.

520867521 is a deficient number, since it is larger than the sum of its proper divisors (257440659).

520867521 is a wasteful number, since it uses less digits than its factorization.

520867521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995696 (or 1995693 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 520867521 is about 22822.5222313398. The cubic root of 520867521 is about 804.5920909618.

The spelling of 520867521 in words is "five hundred twenty million, eight hundred sixty-seven thousand, five hundred twenty-one".