520280557 has 2 divisors, whose sum is σ = 520280558. Its totient is φ = 520280556.

The previous prime is 520280543. The next prime is 520280587. The reversal of 520280557 is 755082025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517062121 + 3218436 = 22739^2 + 1794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520280557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520280587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260140278 + 260140279.

It is an arithmetic number, because the mean of its divisors is an integer number (260140279).

Almost surely, 2^520280557 is an apocalyptic number.

It is an amenable number.

520280557 is a deficient number, since it is larger than the sum of its proper divisors (1).

520280557 is an equidigital number, since it uses as much as digits as its factorization.

520280557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 520280557 is about 22809.6592916247. The cubic root of 520280557 is about 804.2897465826.

The spelling of 520280557 in words is "five hundred twenty million, two hundred eighty thousand, five hundred fifty-seven".