520661161 has 16 divisors (see below), whose sum is σ = 556920000. Its totient is φ = 485352000.

The previous prime is 520661149. The next prime is 520661171. The reversal of 520661161 is 161166025.

It is a cyclic number.

It is not a de Polignac number, because 520661161 - 2⁵ = 520661129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520661131) by changing a digit.

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, 346590 + ... + 348088.

It is an arithmetic number, because the mean of its divisors is an integer number (34807500).

Almost surely, 2^520661161 is an apocalyptic number.

It is an amenable number.

520661161 is a deficient number, since it is larger than the sum of its proper divisors (36258839).

520661161 is a wasteful number, since it uses less digits than its factorization.

520661161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 520661161 is about 22818.0008107634. Note that the first 3 decimals coincide. The cubic root of 520661161 is about 804.4858211018.

The spelling of 520661161 in words is "five hundred twenty million, six hundred sixty-one thousand, one hundred sixty-one".