667171 has 2 divisors, whose sum is σ = 667172. Its totient is φ = 667170.

The previous prime is 667141. The next prime is 667181. The reversal of 667171 is 171766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667171 - 2¹¹ = 665123 is a prime.

It is an Ulam number.

667171 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (667141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333585 + 333586.

It is an arithmetic number, because the mean of its divisors is an integer number (333586).

2⁶⁶⁷¹⁷¹ is an apocalyptic number.

667171 is a deficient number, since it is larger than the sum of its proper divisors (1).

667171 is an equidigital number, since it uses as much as digits as its factorization.

667171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 667171 is about 816.8053623722. The cubic root of 667171 is about 87.3800697084.

It can be divided in two parts, 667 and 171, that added together give a palindrome (838).

The spelling of 667171 in words is "six hundred sixty-seven thousand, one hundred seventy-one".