520866789 has 4 divisors (see below), whose sum is σ = 694489056. Its totient is φ = 347244524.

The previous prime is 520866781. The next prime is 520866803. The reversal of 520866789 is 987668025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520866789 - 2³ = 520866781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520866781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86811129 + ... + 86811134.

It is an arithmetic number, because the mean of its divisors is an integer number (173622264).

Almost surely, 2^520866789 is an apocalyptic number.

It is an amenable number.

520866789 is a deficient number, since it is larger than the sum of its proper divisors (173622267).

520866789 is a wasteful number, since it uses less digits than its factorization.

520866789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173622266.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 520866789 is about 22822.5061945440. The cubic root of 520866789 is about 804.5917140511.

The spelling of 520866789 in words is "five hundred twenty million, eight hundred sixty-six thousand, seven hundred eighty-nine".