871181987 has 6 divisors (see below), whose sum is σ = 943351092. Its totient is φ = 804167832.

The previous prime is 871181963. The next prime is 871182029. The reversal of 871181987 is 789181178.

It is a de Polignac number, because none of the positive numbers 2^k-871181987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871181917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2577293 + ... + 2577630.

It is an arithmetic number, because the mean of its divisors is an integer number (157225182).

Almost surely, 2^871181987 is an apocalyptic number.

871181987 is a deficient number, since it is larger than the sum of its proper divisors (72169105).

871181987 is a wasteful number, since it uses less digits than its factorization.

871181987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154949 (or 5154936 counting only the distinct ones).

The product of its digits is 225792, while the sum is 50.

The square root of 871181987 is about 29515.7921628406. The cubic root of 871181987 is about 955.0724018827.

The spelling of 871181987 in words is "eight hundred seventy-one million, one hundred eighty-one thousand, nine hundred eighty-seven".