520746689 has 2 divisors, whose sum is σ = 520746690. Its totient is φ = 520746688.

The previous prime is 520746683. The next prime is 520746697. The reversal of 520746689 is 986647025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287879089 + 232867600 = 16967^2 + 15260^2 .

It is a cyclic number.

It is not a de Polignac number, because 520746689 - 2²⁸ = 252311233 is a prime.

It is a super-2 number, since 2×520746689² = 542354228208925442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520746683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260373344 + 260373345.

It is an arithmetic number, because the mean of its divisors is an integer number (260373345).

Almost surely, 2^520746689 is an apocalyptic number.

It is an amenable number.

520746689 is a deficient number, since it is larger than the sum of its proper divisors (1).

520746689 is an equidigital number, since it uses as much as digits as its factorization.

520746689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 520746689 is about 22819.8748681933. The cubic root of 520746689 is about 804.5298691323.

The spelling of 520746689 in words is "five hundred twenty million, seven hundred forty-six thousand, six hundred eighty-nine".