520616869 has 2 divisors, whose sum is σ = 520616870. Its totient is φ = 520616868.

The previous prime is 520616861. The next prime is 520616881. The reversal of 520616869 is 968616025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382671844 + 137945025 = 19562^2 + 11745^2 .

It is a cyclic number.

It is not a de Polignac number, because 520616869 - 2³ = 520616861 is a prime.

It is a super-2 number, since 2×520616869² = 542083848574726322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520616861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260308434 + 260308435.

It is an arithmetic number, because the mean of its divisors is an integer number (260308435).

Almost surely, 2^520616869 is an apocalyptic number.

It is an amenable number.

520616869 is a deficient number, since it is larger than the sum of its proper divisors (1).

520616869 is an equidigital number, since it uses as much as digits as its factorization.

520616869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 520616869 is about 22817.0302405900. The cubic root of 520616869 is about 804.4630082508.

The spelling of 520616869 in words is "five hundred twenty million, six hundred sixteen thousand, eight hundred sixty-nine".