871389491 has 12 divisors (see below), whose sum is σ = 1022963040. Its totient is φ = 740048400.

The previous prime is 871389487. The next prime is 871389499. The reversal of 871389491 is 194983178.

It is not a de Polignac number, because 871389491 - 2² = 871389487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871389499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76235 + ... + 86916.

It is an arithmetic number, because the mean of its divisors is an integer number (85246920).

Almost surely, 2^871389491 is an apocalyptic number.

871389491 is a deficient number, since it is larger than the sum of its proper divisors (151573549).

871389491 is a wasteful number, since it uses less digits than its factorization.

871389491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163274 (or 163267 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 871389491 is about 29519.3070887513. The cubic root of 871389491 is about 955.1482243913.

The spelling of 871389491 in words is "eight hundred seventy-one million, three hundred eighty-nine thousand, four hundred ninety-one".