520738561 has 16 divisors (see below), whose sum is σ = 621831168. Its totient is φ = 426373200.

The previous prime is 520738553. The next prime is 520738573. The reversal of 520738561 is 165837025.

It is a cyclic number.

It is not a de Polignac number, because 520738561 - 2³ = 520738553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520738561.

It is not an unprimeable number, because it can be changed into a prime (520738541) 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, 154666 + ... + 157996.

It is an arithmetic number, because the mean of its divisors is an integer number (38864448).

Almost surely, 2^520738561 is an apocalyptic number.

It is an amenable number.

520738561 is a deficient number, since it is larger than the sum of its proper divisors (101092607).

520738561 is a wasteful number, since it uses less digits than its factorization.

520738561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 520738561 is about 22819.6967771266. The cubic root of 520738561 is about 804.5256833141.

The spelling of 520738561 in words is "five hundred twenty million, seven hundred thirty-eight thousand, five hundred sixty-one".