520515745 has 16 divisors (see below), whose sum is σ = 639543888. Its totient is φ = 406563840.

The previous prime is 520515727. The next prime is 520515757. The reversal of 520515745 is 547515025.

It can be written as a sum of positive squares in 8 ways, for example, as 12103441 + 508412304 = 3479^2 + 22548^2 .

It is not a de Polignac number, because 520515745 - 2⁵ = 520515713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520515745.

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 15 ways as a sum of consecutive naturals, for example, 35557 + ... + 48013.

It is an arithmetic number, because the mean of its divisors is an integer number (39971493).

Almost surely, 2^520515745 is an apocalyptic number.

It is an amenable number.

520515745 is a deficient number, since it is larger than the sum of its proper divisors (119028143).

520515745 is a wasteful number, since it uses less digits than its factorization.

520515745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12660.

The product of its (nonzero) digits is 35000, while the sum is 34.

The square root of 520515745 is about 22814.8141565957. The cubic root of 520515745 is about 804.4109188995.

The spelling of 520515745 in words is "five hundred twenty million, five hundred fifteen thousand, seven hundred forty-five".