198099257 has 2 divisors, whose sum is σ = 198099258. Its totient is φ = 198099256.

The previous prime is 198099247. The next prime is 198099259. The reversal of 198099257 is 752990891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188760121 + 9339136 = 13739^2 + 3056^2 .

It is an emirp because it is prime and its reverse (752990891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198099257 - 2⁶ = 198099193 is a prime.

Together with 198099259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198099259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99049628 + 99049629.

It is an arithmetic number, because the mean of its divisors is an integer number (99049629).

Almost surely, 2^198099257 is an apocalyptic number.

It is an amenable number.

198099257 is a deficient number, since it is larger than the sum of its proper divisors (1).

198099257 is an equidigital number, since it uses as much as digits as its factorization.

198099257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 198099257 is about 14074.7737814858. The cubic root of 198099257 is about 582.9450455082.

The spelling of 198099257 in words is "one hundred ninety-eight million, ninety-nine thousand, two hundred fifty-seven".