520353985 has 4 divisors (see below), whose sum is σ = 624424788. Its totient is φ = 416283184.

The previous prime is 520353983. The next prime is 520353991. The reversal of 520353985 is 589353025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131515024 + 388838961 = 11468^2 + 19719^2 .

It is a cyclic number.

It is not a de Polignac number, because 520353985 - 2¹ = 520353983 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520353983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52035394 + ... + 52035403.

It is an arithmetic number, because the mean of its divisors is an integer number (156106197).

Almost surely, 2^520353985 is an apocalyptic number.

It is an amenable number.

520353985 is a deficient number, since it is larger than the sum of its proper divisors (104070803).

520353985 is a wasteful number, since it uses less digits than its factorization.

520353985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104070802.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 520353985 is about 22811.2688160918. The cubic root of 520353985 is about 804.3275816882.

The spelling of 520353985 in words is "five hundred twenty million, three hundred fifty-three thousand, nine hundred eighty-five".