198097997 has 4 divisors (see below), whose sum is σ = 202312896. Its totient is φ = 193883100.

The previous prime is 198097993. The next prime is 198098039. The reversal of 198097997 is 799790891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198097997 - 2² = 198097993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198097993) 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 in 3 ways as a sum of consecutive naturals, for example, 2107379 + ... + 2107472.

It is an arithmetic number, because the mean of its divisors is an integer number (50578224).

Almost surely, 2^198097997 is an apocalyptic number.

It is an amenable number.

198097997 is a deficient number, since it is larger than the sum of its proper divisors (4214899).

198097997 is an equidigital number, since it uses as much as digits as its factorization.

198097997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214898.

The product of its (nonzero) digits is 2571912, while the sum is 59.

The square root of 198097997 is about 14074.7290204821. The cubic root of 198097997 is about 582.9438095750.

The spelling of 198097997 in words is "one hundred ninety-eight million, ninety-seven thousand, nine hundred ninety-seven".