515725513 has 2 divisors, whose sum is σ = 515725514. Its totient is φ = 515725512.

The previous prime is 515725489. The next prime is 515725523. The reversal of 515725513 is 315527515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400120009 + 115605504 = 20003^2 + 10752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-515725513 is a prime.

It is a super-2 number, since 2×515725513² = 531945609518226338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (515725523) 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, 257862756 + 257862757.

It is an arithmetic number, because the mean of its divisors is an integer number (257862757).

Almost surely, 2^515725513 is an apocalyptic number.

It is an amenable number.

515725513 is a deficient number, since it is larger than the sum of its proper divisors (1).

515725513 is an equidigital number, since it uses as much as digits as its factorization.

515725513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26250, while the sum is 34.

The square root of 515725513 is about 22709.5907713019. The cubic root of 515725513 is about 801.9356839861.

The spelling of 515725513 in words is "five hundred fifteen million, seven hundred twenty-five thousand, five hundred thirteen".