520778623 has 2 divisors, whose sum is σ = 520778624. Its totient is φ = 520778622.

The previous prime is 520778617. The next prime is 520778639. The reversal of 520778623 is 326877025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520778623 - 2²⁵ = 487224191 is a prime.

It is a super-2 number, since 2×520778623² = 542420748347552258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520778653) 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, 260389311 + 260389312.

It is an arithmetic number, because the mean of its divisors is an integer number (260389312).

Almost surely, 2^520778623 is an apocalyptic number.

520778623 is a deficient number, since it is larger than the sum of its proper divisors (1).

520778623 is an equidigital number, since it uses as much as digits as its factorization.

520778623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 520778623 is about 22820.5745545549. The cubic root of 520778623 is about 804.5463143203.

The spelling of 520778623 in words is "five hundred twenty million, seven hundred seventy-eight thousand, six hundred twenty-three".