520663771 has 4 divisors (see below), whose sum is σ = 522957672. Its totient is φ = 518369872.

The previous prime is 520663763. The next prime is 520663921. The reversal of 520663771 is 177366025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520663771 - 2³ = 520663763 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 520663771.

It is not an unprimeable number, because it can be changed into a prime (520663721) 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, 1146610 + ... + 1147063.

It is an arithmetic number, because the mean of its divisors is an integer number (130739418).

Almost surely, 2^520663771 is an apocalyptic number.

520663771 is a deficient number, since it is larger than the sum of its proper divisors (2293901).

520663771 is a wasteful number, since it uses less digits than its factorization.

520663771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293900.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 520663771 is about 22818.0580023805. The cubic root of 520663771 is about 804.4871653570.

The spelling of 520663771 in words is "five hundred twenty million, six hundred sixty-three thousand, seven hundred seventy-one".