671491789 has 12 divisors (see below), whose sum is σ = 714754944. Its totient is φ = 630716864.

The previous prime is 671491783. The next prime is 671491813. The reversal of 671491789 is 987194176.

It is not a de Polignac number, because 671491789 - 2⁵ = 671491757 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 (671491783) 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, 160644 + ... + 164770.

It is an arithmetic number, because the mean of its divisors is an integer number (59562912).

Almost surely, 2^671491789 is an apocalyptic number.

It is an amenable number.

671491789 is a deficient number, since it is larger than the sum of its proper divisors (43263155).

671491789 is a wasteful number, since it uses less digits than its factorization.

671491789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724 (or 4707 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The square root of 671491789 is about 25913.1586071633. The cubic root of 671491789 is about 875.6829667557.

The spelling of 671491789 in words is "six hundred seventy-one million, four hundred ninety-one thousand, seven hundred eighty-nine".