871191431623 has 4 divisors (see below), whose sum is σ = 892440003168. Its totient is φ = 849942860080.

The previous prime is 871191431573. The next prime is 871191431681. The reversal of 871191431623 is 326134191178.

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 871191431623 - 2³³ = 862601497031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871191431683) 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, 10624285711 + ... + 10624285792.

It is an arithmetic number, because the mean of its divisors is an integer number (223110000792).

Almost surely, 2^871191431623 is an apocalyptic number.

871191431623 is a deficient number, since it is larger than the sum of its proper divisors (21248571545).

871191431623 is a wasteful number, since it uses less digits than its factorization.

871191431623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21248571544.

The product of its digits is 217728, while the sum is 46.

The spelling of 871191431623 in words is "eight hundred seventy-one billion, one hundred ninety-one million, four hundred thirty-one thousand, six hundred twenty-three".