8720171 has 2 divisors, whose sum is σ = 8720172. Its totient is φ = 8720170.

The previous prime is 8720161. The next prime is 8720177. The reversal of 8720171 is 1710278.

8720171 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8720171 - 2¹⁴ = 8703787 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8720171.

It is not a weakly prime, because it can be changed into another prime (8720177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360085 + 4360086.

It is an arithmetic number, because the mean of its divisors is an integer number (4360086).

Almost surely, 2^8720171 is an apocalyptic number.

8720171 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720171 is an equidigital number, since it uses as much as digits as its factorization.

8720171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 8720171 is about 2952.9935658582. The cubic root of 8720171 is about 205.8298387441.

The spelling of 8720171 in words is "eight million, seven hundred twenty thousand, one hundred seventy-one".