8538171209 has 2 divisors, whose sum is σ = 8538171210. Its totient is φ = 8538171208.

The previous prime is 8538171193. The next prime is 8538171211. The reversal of 8538171209 is 9021718358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8477253184 + 60918025 = 92072^2 + 7805^2 .

It is a cyclic number.

It is not a de Polignac number, because 8538171209 - 2⁴ = 8538171193 is a prime.

Together with 8538171211, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8538171209.

It is not a weakly prime, because it can be changed into another prime (8538171269) 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, 4269085604 + 4269085605.

It is an arithmetic number, because the mean of its divisors is an integer number (4269085605).

Almost surely, 2^8538171209 is an apocalyptic number.

It is an amenable number.

8538171209 is a deficient number, since it is larger than the sum of its proper divisors (1).

8538171209 is an equidigital number, since it uses as much as digits as its factorization.

8538171209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 8538171209 is about 92402.2251301342. The cubic root of 8538171209 is about 2043.8779248590.

The spelling of 8538171209 in words is "eight billion, five hundred thirty-eight million, one hundred seventy-one thousand, two hundred nine".