515238109 has 2 divisors, whose sum is σ = 515238110. Its totient is φ = 515238108.

The previous prime is 515238071. The next prime is 515238127. The reversal of 515238109 is 901832515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483032484 + 32205625 = 21978^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 515238109 - 2⁷ = 515237981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515238179) 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, 257619054 + 257619055.

It is an arithmetic number, because the mean of its divisors is an integer number (257619055).

Almost surely, 2^515238109 is an apocalyptic number.

It is an amenable number.

515238109 is a deficient number, since it is larger than the sum of its proper divisors (1).

515238109 is an equidigital number, since it uses as much as digits as its factorization.

515238109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 515238109 is about 22698.8569976552. The cubic root of 515238109 is about 801.6829721275.

The spelling of 515238109 in words is "five hundred fifteen million, two hundred thirty-eight thousand, one hundred nine".