513123517 has 2 divisors, whose sum is σ = 513123518. Its totient is φ = 513123516.

The previous prime is 513123509. The next prime is 513123539. The reversal of 513123517 is 715321315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401842116 + 111281401 = 20046^2 + 10549^2 .

It is a cyclic number.

It is not a de Polignac number, because 513123517 - 2³ = 513123509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513123547) 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, 256561758 + 256561759.

It is an arithmetic number, because the mean of its divisors is an integer number (256561759).

Almost surely, 2^513123517 is an apocalyptic number.

It is an amenable number.

513123517 is a deficient number, since it is larger than the sum of its proper divisors (1).

513123517 is an equidigital number, since it uses as much as digits as its factorization.

513123517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 28.

The square root of 513123517 is about 22652.2298460880. The cubic root of 513123517 is about 800.5847376025.

The spelling of 513123517 in words is "five hundred thirteen million, one hundred twenty-three thousand, five hundred seventeen".