871761891 has 96 divisors (see below), whose sum is σ = 1606929408. Its totient is φ = 413199360.

The previous prime is 871761859. The next prime is 871761907. The reversal of 871761891 is 198167178.

It is not a de Polignac number, because 871761891 - 2⁵ = 871761859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 871761891.

It is not an unprimeable number, because it can be changed into a prime (871761851) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2375190 + ... + 2375556.

It is an arithmetic number, because the mean of its divisors is an integer number (16738848).

Almost surely, 2^871761891 is an apocalyptic number.

871761891 is a deficient number, since it is larger than the sum of its proper divisors (735167517).

871761891 is a wasteful number, since it uses less digits than its factorization.

871761891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 514 counting only the distinct ones).

The product of its digits is 169344, while the sum is 48.

The square root of 871761891 is about 29525.6141511062. The cubic root of 871761891 is about 955.2842701526.

The spelling of 871761891 in words is "eight hundred seventy-one million, seven hundred sixty-one thousand, eight hundred ninety-one".