515172109 has 2 divisors, whose sum is σ = 515172110. Its totient is φ = 515172108.

The previous prime is 515172103. The next prime is 515172143. The reversal of 515172109 is 901271515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 457746025 + 57426084 = 21395^2 + 7578^2 .

It is a cyclic number.

It is not a de Polignac number, because 515172109 - 2²¹ = 513074957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515172103) 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, 257586054 + 257586055.

It is an arithmetic number, because the mean of its divisors is an integer number (257586055).

Almost surely, 2^515172109 is an apocalyptic number.

It is an amenable number.

515172109 is a deficient number, since it is larger than the sum of its proper divisors (1).

515172109 is an equidigital number, since it uses as much as digits as its factorization.

515172109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 515172109 is about 22697.4031333983. The cubic root of 515172109 is about 801.6487398410.

The spelling of 515172109 in words is "five hundred fifteen million, one hundred seventy-two thousand, one hundred nine".