871919197 has 2 divisors, whose sum is σ = 871919198. Its totient is φ = 871919196.

The previous prime is 871919189. The next prime is 871919221. The reversal of 871919197 is 791919178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662856516 + 209062681 = 25746^2 + 14459^2 .

It is a cyclic number.

It is not a de Polignac number, because 871919197 - 2³ = 871919189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871919107) 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, 435959598 + 435959599.

It is an arithmetic number, because the mean of its divisors is an integer number (435959599).

Almost surely, 2^871919197 is an apocalyptic number.

It is an amenable number.

871919197 is a deficient number, since it is larger than the sum of its proper divisors (1).

871919197 is an equidigital number, since it uses as much as digits as its factorization.

871919197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 52.

The square root of 871919197 is about 29528.2779213418. The cubic root of 871919197 is about 955.3417257916.

The spelling of 871919197 in words is "eight hundred seventy-one million, nine hundred nineteen thousand, one hundred ninety-seven".