871631949181 has 16 divisors (see below), whose sum is σ = 1037894860800. Its totient is φ = 716255529840.

The previous prime is 871631949179. The next prime is 871631949239. The reversal of 871631949181 is 181949136178.

It is a happy number.

871631949181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 871631949181 - 2¹ = 871631949179 is a prime.

It is a super-2 number, since 2×871631949181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871631947181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18746581 + ... + 18793018.

It is an arithmetic number, because the mean of its divisors is an integer number (64868428800).

Almost surely, 2^871631949181 is an apocalyptic number.

It is an amenable number.

871631949181 is a deficient number, since it is larger than the sum of its proper divisors (166262911619).

871631949181 is a wasteful number, since it uses less digits than its factorization.

871631949181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37539744.

The product of its digits is 2612736, while the sum is 58.

The spelling of 871631949181 in words is "eight hundred seventy-one billion, six hundred thirty-one million, nine hundred forty-nine thousand, one hundred eighty-one".