198257 has 2 divisors, whose sum is σ = 198258. Its totient is φ = 198256.
The previous prime is 198251. The next prime is 198259. The reversal of 198257 is 752891.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 167281 + 30976 = 409^2 + 176^2 .
It is an emirp because it is prime and its reverse (752891) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 198257 - 24 = 198241 is a prime.
Together with 198259, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198257.
It is not a weakly prime, because it can be changed into another prime (198251) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99128 + 99129.
It is an arithmetic number, because the mean of its divisors is an integer number (99129).
2198257 is an apocalyptic number.
It is an amenable number.
198257 is a deficient number, since it is larger than the sum of its proper divisors (1).
198257 is an equidigital number, since it uses as much as digits as its factorization.
198257 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5040, while the sum is 32.
The square root of 198257 is about 445.2605978525. The cubic root of 198257 is about 58.3099734131.
The spelling of 198257 in words is "one hundred ninety-eight thousand, two hundred fifty-seven".
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