520978985 has 4 divisors (see below), whose sum is σ = 625174788. Its totient is φ = 416783184.

The previous prime is 520978961. The next prime is 520978999. The reversal of 520978985 is 589879025.

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 376786921 + 144192064 = 19411^2 + 12008^2 .

It is a cyclic number.

It is not a de Polignac number, because 520978985 - 2⁶ = 520978921 is a prime.

It is a Duffinian number.

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, 52097894 + ... + 52097903.

It is an arithmetic number, because the mean of its divisors is an integer number (156293697).

Almost surely, 2^520978985 is an apocalyptic number.

It is an amenable number.

520978985 is a deficient number, since it is larger than the sum of its proper divisors (104195803).

520978985 is a wasteful number, since it uses less digits than its factorization.

520978985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104195802.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The square root of 520978985 is about 22824.9640744515. The cubic root of 520978985 is about 804.6494802548.

The spelling of 520978985 in words is "five hundred twenty million, nine hundred seventy-eight thousand, nine hundred eighty-five".