871608091 has 4 divisors (see below), whose sum is σ = 890152992. Its totient is φ = 853063192.

The previous prime is 871608043. The next prime is 871608097. The reversal of 871608091 is 190806178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 871608091 - 2⁹ = 871607579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871608097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9272380 + ... + 9272473.

It is an arithmetic number, because the mean of its divisors is an integer number (222538248).

Almost surely, 2^871608091 is an apocalyptic number.

871608091 is a deficient number, since it is larger than the sum of its proper divisors (18544901).

871608091 is a wasteful number, since it uses less digits than its factorization.

871608091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18544900.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 871608091 is about 29523.0095180014. The cubic root of 871608091 is about 955.2280883888.

The spelling of 871608091 in words is "eight hundred seventy-one million, six hundred eight thousand, ninety-one".