520199789 has 2 divisors, whose sum is σ = 520199790. Its totient is φ = 520199788.

The previous prime is 520199741. The next prime is 520199791. The reversal of 520199789 is 987991025.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498762889 + 21436900 = 22333^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 520199789 - 2¹² = 520195693 is a prime.

It is a super-3 number, since 3×520199789³ (a number of 27 digits) contains 333 as substring.

Together with 520199791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520199089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260099894 + 260099895.

It is an arithmetic number, because the mean of its divisors is an integer number (260099895).

Almost surely, 2^520199789 is an apocalyptic number.

It is an amenable number.

520199789 is a deficient number, since it is larger than the sum of its proper divisors (1).

520199789 is an equidigital number, since it uses as much as digits as its factorization.

520199789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 520199789 is about 22807.8887449058. Note that the first 3 decimals coincide. The cubic root of 520199789 is about 804.2481252976.

The spelling of 520199789 in words is "five hundred twenty million, one hundred ninety-nine thousand, seven hundred eighty-nine".