491364173 has 2 divisors, whose sum is σ = 491364174. Its totient is φ = 491364172.

The previous prime is 491364151. The next prime is 491364217. The reversal of 491364173 is 371463194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459802249 + 31561924 = 21443^2 + 5618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491364173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491364103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245682086 + 245682087.

It is an arithmetic number, because the mean of its divisors is an integer number (245682087).

Almost surely, 2^491364173 is an apocalyptic number.

It is an amenable number.

491364173 is a deficient number, since it is larger than the sum of its proper divisors (1).

491364173 is an equidigital number, since it uses as much as digits as its factorization.

491364173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 491364173 is about 22166.7357317220. The cubic root of 491364173 is about 789.1044560062.

The spelling of 491364173 in words is "four hundred ninety-one million, three hundred sixty-four thousand, one hundred seventy-three".