669173 has 2 divisors, whose sum is σ = 669174. Its totient is φ = 669172.

The previous prime is 669167. The next prime is 669181. The reversal of 669173 is 371966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669124 + 49 = 818^2 + 7^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334586 + 334587.

It is an arithmetic number, because the mean of its divisors is an integer number (334587).

2⁶⁶⁹¹⁷³ is an apocalyptic number.

It is an amenable number.

669173 is a deficient number, since it is larger than the sum of its proper divisors (1).

669173 is an equidigital number, since it uses as much as digits as its factorization.

669173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 669173 is about 818.0299505519. The cubic root of 669173 is about 87.4673837619.

The spelling of 669173 in words is "six hundred sixty-nine thousand, one hundred seventy-three".