520744669 has 2 divisors, whose sum is σ = 520744670. Its totient is φ = 520744668.

The previous prime is 520744667. The next prime is 520744691. The reversal of 520744669 is 966447025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512479044 + 8265625 = 22638^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 520744669 - 2¹ = 520744667 is a prime.

It is a super-2 number, since 2×520744669² = 542350020583839122, which contains 22 as substring.

Together with 520744667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520744661) 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, 260372334 + 260372335.

It is an arithmetic number, because the mean of its divisors is an integer number (260372335).

Almost surely, 2^520744669 is an apocalyptic number.

It is an amenable number.

520744669 is a deficient number, since it is larger than the sum of its proper divisors (1).

520744669 is an equidigital number, since it uses as much as digits as its factorization.

520744669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 520744669 is about 22819.8306084861. The cubic root of 520744669 is about 804.5288288616.

The spelling of 520744669 in words is "five hundred twenty million, seven hundred forty-four thousand, six hundred sixty-nine".