520656869 has 2 divisors, whose sum is σ = 520656870. Its totient is φ = 520656868.

The previous prime is 520656803. The next prime is 520656881. The reversal of 520656869 is 968656025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266668900 + 253987969 = 16330^2 + 15937^2 .

It is a cyclic number.

It is not a de Polignac number, because 520656869 - 2⁸ = 520656613 is a prime.

It is a super-2 number, since 2×520656869² = 542167150473766322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520656889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260328434 + 260328435.

It is an arithmetic number, because the mean of its divisors is an integer number (260328435).

Almost surely, 2^520656869 is an apocalyptic number.

It is an amenable number.

520656869 is a deficient number, since it is larger than the sum of its proper divisors (1).

520656869 is an equidigital number, since it uses as much as digits as its factorization.

520656869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 520656869 is about 22817.9067620148. The cubic root of 520656869 is about 804.4836105389.

The spelling of 520656869 in words is "five hundred twenty million, six hundred fifty-six thousand, eight hundred sixty-nine".