520640169 has 16 divisors (see below), whose sum is σ = 794526720. Its totient is φ = 297069840.

The previous prime is 520640143. The next prime is 520640171. The reversal of 520640169 is 961046025.

It is not a de Polignac number, because 520640169 - 2⁵ = 520640137 is a prime.

It is a super-2 number, since 2×520640169² = 542132371152697122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520640129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3429 + ... + 32450.

It is an arithmetic number, because the mean of its divisors is an integer number (49657920).

Almost surely, 2^520640169 is an apocalyptic number.

It is an amenable number.

520640169 is a deficient number, since it is larger than the sum of its proper divisors (273886551).

520640169 is a wasteful number, since it uses less digits than its factorization.

520640169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36580.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 520640169 is about 22817.5408184142. The cubic root of 520640169 is about 804.4750092119.

The spelling of 520640169 in words is "five hundred twenty million, six hundred forty thousand, one hundred sixty-nine".