198175997 has 2 divisors, whose sum is σ = 198175998. Its totient is φ = 198175996.

The previous prime is 198175993. The next prime is 198176009. The reversal of 198175997 is 799571891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195832036 + 2343961 = 13994^2 + 1531^2 .

It is an emirp because it is prime and its reverse (799571891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198175997 - 2² = 198175993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198175993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99087998 + 99087999.

It is an arithmetic number, because the mean of its divisors is an integer number (99087999).

Almost surely, 2^198175997 is an apocalyptic number.

It is an amenable number.

198175997 is a deficient number, since it is larger than the sum of its proper divisors (1).

198175997 is an equidigital number, since it uses as much as digits as its factorization.

198175997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 56.

The square root of 198175997 is about 14077.4996714615. The cubic root of 198175997 is about 583.0203098448.

The spelling of 198175997 in words is "one hundred ninety-eight million, one hundred seventy-five thousand, nine hundred ninety-seven".