198327257 has 2 divisors, whose sum is σ = 198327258. Its totient is φ = 198327256.

The previous prime is 198327251. The next prime is 198327281. The reversal of 198327257 is 752723891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171505216 + 26822041 = 13096^2 + 5179^2 .

It is an emirp because it is prime and its reverse (752723891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198327257 - 2⁶ = 198327193 is a prime.

It is not a weakly prime, because it can be changed into another prime (198327251) 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, 99163628 + 99163629.

It is an arithmetic number, because the mean of its divisors is an integer number (99163629).

Almost surely, 2^198327257 is an apocalyptic number.

It is an amenable number.

198327257 is a deficient number, since it is larger than the sum of its proper divisors (1).

198327257 is an equidigital number, since it uses as much as digits as its factorization.

198327257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 198327257 is about 14082.8710496120. The cubic root of 198327257 is about 583.1686043342.

The spelling of 198327257 in words is "one hundred ninety-eight million, three hundred twenty-seven thousand, two hundred fifty-seven".