520003689 has 4 divisors (see below), whose sum is σ = 693338256. Its totient is φ = 346669124.

The previous prime is 520003663. The next prime is 520003699. The reversal of 520003689 is 986300025.

It is a happy number.

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 520003689 - 2⁸ = 520003433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520003699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86667279 + ... + 86667284.

It is an arithmetic number, because the mean of its divisors is an integer number (173334564).

Almost surely, 2^520003689 is an apocalyptic number.

It is an amenable number.

520003689 is a deficient number, since it is larger than the sum of its proper divisors (173334567).

520003689 is a wasteful number, since it uses less digits than its factorization.

520003689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173334566.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 520003689 is about 22803.5893885151. The cubic root of 520003689 is about 804.1470533104.

The spelling of 520003689 in words is "five hundred twenty million, three thousand, six hundred eighty-nine".