671009161 has 4 divisors (see below), whose sum is σ = 671718672. Its totient is φ = 670299652.

The previous prime is 671009147. The next prime is 671009179. The reversal of 671009161 is 161900176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671009161 - 2⁷ = 671009033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671009191) 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, 353335 + ... + 355228.

It is an arithmetic number, because the mean of its divisors is an integer number (167929668).

Almost surely, 2^671009161 is an apocalyptic number.

It is an amenable number.

671009161 is a deficient number, since it is larger than the sum of its proper divisors (709511).

671009161 is an equidigital number, since it uses as much as digits as its factorization.

671009161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709510.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 671009161 is about 25903.8445216149. The cubic root of 671009161 is about 875.4731203512.

The spelling of 671009161 in words is "six hundred seventy-one million, nine thousand, one hundred sixty-one".