198271897 has 8 divisors (see below), whose sum is σ = 213148800. Its totient is φ = 183839184.

The previous prime is 198271873. The next prime is 198271903. The reversal of 198271897 is 798172891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198271897 - 2¹⁹ = 197747609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198271397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110122 + ... + 111907.

It is an arithmetic number, because the mean of its divisors is an integer number (26643600).

Almost surely, 2^198271897 is an apocalyptic number.

It is an amenable number.

198271897 is a deficient number, since it is larger than the sum of its proper divisors (14876903).

198271897 is a wasteful number, since it uses less digits than its factorization.

198271897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222095.

The product of its digits is 508032, while the sum is 52.

The square root of 198271897 is about 14080.9054041280. The cubic root of 198271897 is about 583.1143384393.

The spelling of 198271897 in words is "one hundred ninety-eight million, two hundred seventy-one thousand, eight hundred ninety-seven".