671312171 has 4 divisors (see below), whose sum is σ = 680767344. Its totient is φ = 661857000.

The previous prime is 671312149. The next prime is 671312177. The reversal of 671312171 is 171213176.

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 671312171 - 2⁶ = 671312107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671312177) 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, 4727480 + ... + 4727621.

It is an arithmetic number, because the mean of its divisors is an integer number (170191836).

Almost surely, 2^671312171 is an apocalyptic number.

671312171 is a deficient number, since it is larger than the sum of its proper divisors (9455173).

671312171 is an equidigital number, since it uses as much as digits as its factorization.

671312171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455172.

The product of its digits is 1764, while the sum is 29.

The square root of 671312171 is about 25909.6926072078. The cubic root of 671312171 is about 875.6048806931.

The spelling of 671312171 in words is "six hundred seventy-one million, three hundred twelve thousand, one hundred seventy-one".