671161 has 2 divisors, whose sum is σ = 671162. Its totient is φ = 671160.

The previous prime is 671159. The next prime is 671189. The reversal of 671161 is 161176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 400 = 819^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 671161 - 2¹ = 671159 is a prime.

Together with 671159, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335580 + 335581.

It is an arithmetic number, because the mean of its divisors is an integer number (335581).

2⁶⁷¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

671161 is a deficient number, since it is larger than the sum of its proper divisors (1).

671161 is an equidigital number, since it uses as much as digits as its factorization.

671161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 22.

The square root of 671161 is about 819.2441638486. The cubic root of 671161 is about 87.5539150715.

The spelling of 671161 in words is "six hundred seventy-one thousand, one hundred sixty-one".