520724251 has 2 divisors, whose sum is σ = 520724252. Its totient is φ = 520724250.

The previous prime is 520724221. The next prime is 520724293. The reversal of 520724251 is 152427025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520724251 - 2⁷ = 520724123 is a prime.

It is a super-2 number, since 2×520724251² = 542307491159022002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520724221) 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, 260362125 + 260362126.

It is an arithmetic number, because the mean of its divisors is an integer number (260362126).

Almost surely, 2^520724251 is an apocalyptic number.

520724251 is a deficient number, since it is larger than the sum of its proper divisors (1).

520724251 is an equidigital number, since it uses as much as digits as its factorization.

520724251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 520724251 is about 22819.3832300525. The cubic root of 520724251 is about 804.5183137376.

The spelling of 520724251 in words is "five hundred twenty million, seven hundred twenty-four thousand, two hundred fifty-one".