671831893 has 4 divisors (see below), whose sum is σ = 694998540. Its totient is φ = 648665248.

The previous prime is 671831873. The next prime is 671831899. The reversal of 671831893 is 398138176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 438567364 + 233264529 = 20942^2 + 15273^2 .

It is a cyclic number.

It is not a de Polignac number, because 671831893 - 2⁵ = 671831861 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 (671831899) 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, 11583280 + ... + 11583337.

It is an arithmetic number, because the mean of its divisors is an integer number (173749635).

Almost surely, 2^671831893 is an apocalyptic number.

It is an amenable number.

671831893 is a deficient number, since it is larger than the sum of its proper divisors (23166647).

671831893 is a wasteful number, since it uses less digits than its factorization.

671831893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23166646.

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

The square root of 671831893 is about 25919.7201566684. The cubic root of 671831893 is about 875.8307834117.

The spelling of 671831893 in words is "six hundred seventy-one million, eight hundred thirty-one thousand, eight hundred ninety-three".