520868819 has 4 divisors (see below), whose sum is σ = 521490480. Its totient is φ = 520247160.

The previous prime is 520868809. The next prime is 520868857. The reversal of 520868819 is 918868025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520868819 is a prime.

It is a super-2 number, since 2×520868819² = 542608653212909522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520868809) 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, 309572 + ... + 311249.

It is an arithmetic number, because the mean of its divisors is an integer number (130372620).

Almost surely, 2^520868819 is an apocalyptic number.

520868819 is a deficient number, since it is larger than the sum of its proper divisors (621661).

520868819 is an equidigital number, since it uses as much as digits as its factorization.

520868819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621660.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 520868819 is about 22822.5506681440. The cubic root of 520868819 is about 804.5927593081.

The spelling of 520868819 in words is "five hundred twenty million, eight hundred sixty-eight thousand, eight hundred nineteen".