173668813 has 2 divisors, whose sum is σ = 173668814. Its totient is φ = 173668812.

The previous prime is 173668799. The next prime is 173668819. The reversal of 173668813 is 318866371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171557604 + 2111209 = 13098^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 173668813 - 2¹³ = 173660621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 173668813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173668819) 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, 86834406 + 86834407.

It is an arithmetic number, because the mean of its divisors is an integer number (86834407).

Almost surely, 2^173668813 is an apocalyptic number.

It is an amenable number.

173668813 is a deficient number, since it is larger than the sum of its proper divisors (1).

173668813 is an equidigital number, since it uses as much as digits as its factorization.

173668813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 173668813 is about 13178.3463681905. The cubic root of 173668813 is about 557.9225889624.

The spelling of 173668813 in words is "one hundred seventy-three million, six hundred sixty-eight thousand, eight hundred thirteen".