871847117 has 2 divisors, whose sum is σ = 871847118. Its totient is φ = 871847116.

The previous prime is 871847111. The next prime is 871847149. The reversal of 871847117 is 711748178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617572201 + 254274916 = 24851^2 + 15946^2 .

It is a cyclic number.

It is not a de Polignac number, because 871847117 - 2⁸ = 871846861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871847111) 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, 435923558 + 435923559.

It is an arithmetic number, because the mean of its divisors is an integer number (435923559).

Almost surely, 2^871847117 is an apocalyptic number.

It is an amenable number.

871847117 is a deficient number, since it is larger than the sum of its proper divisors (1).

871847117 is an equidigital number, since it uses as much as digits as its factorization.

871847117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87808, while the sum is 44.

The square root of 871847117 is about 29527.0573711638. The cubic root of 871847117 is about 955.3153996025.

The spelling of 871847117 in words is "eight hundred seventy-one million, eight hundred forty-seven thousand, one hundred seventeen".