198173893 has 2 divisors, whose sum is σ = 198173894. Its totient is φ = 198173892.

The previous prime is 198173891. The next prime is 198173909. The reversal of 198173893 is 398371891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170485249 + 27688644 = 13057^2 + 5262^2 .

It is a cyclic number.

It is not a de Polignac number, because 198173893 - 2¹ = 198173891 is a prime.

Together with 198173891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198173891) 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, 99086946 + 99086947.

It is an arithmetic number, because the mean of its divisors is an integer number (99086947).

Almost surely, 2^198173893 is an apocalyptic number.

It is an amenable number.

198173893 is a deficient number, since it is larger than the sum of its proper divisors (1).

198173893 is an equidigital number, since it uses as much as digits as its factorization.

198173893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 198173893 is about 14077.4249420837. The cubic root of 198173893 is about 583.0182465625.

The spelling of 198173893 in words is "one hundred ninety-eight million, one hundred seventy-three thousand, eight hundred ninety-three".