198101997 has 16 divisors (see below), whose sum is σ = 302952960. Its totient is φ = 127807200.

The previous prime is 198101977. The next prime is 198102011. The reversal of 198101997 is 799101891.

It is not a de Polignac number, because 198101997 - 2⁸ = 198101741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198101947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117504 + ... + 119177.

It is an arithmetic number, because the mean of its divisors is an integer number (18934560).

Almost surely, 2^198101997 is an apocalyptic number.

It is an amenable number.

198101997 is a deficient number, since it is larger than the sum of its proper divisors (104850963).

198101997 is a wasteful number, since it uses less digits than its factorization.

198101997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236721 (or 236715 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 198101997 is about 14074.8711184153. The cubic root of 198101997 is about 582.9477331542.

The spelling of 198101997 in words is "one hundred ninety-eight million, one hundred one thousand, nine hundred ninety-seven".