198991497 has 8 divisors (see below), whose sum is σ = 265456800. Its totient is φ = 132593600.

The previous prime is 198991493. The next prime is 198991501. The reversal of 198991497 is 794199891.

It is an interprime number because it is at equal distance from previous prime (198991493) and next prime (198991501).

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

It is a cyclic number.

It is not a de Polignac number, because 198991497 - 2² = 198991493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198991493) 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, 9504 + ... + 22097.

It is an arithmetic number, because the mean of its divisors is an integer number (33182100).

Almost surely, 2^198991497 is an apocalyptic number.

It is an amenable number.

198991497 is a deficient number, since it is larger than the sum of its proper divisors (66465303).

198991497 is a wasteful number, since it uses less digits than its factorization.

198991497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33703.

The product of its digits is 1469664, while the sum is 57.

The square root of 198991497 is about 14106.4345956021. The cubic root of 198991497 is about 583.8189305809.

The spelling of 198991497 in words is "one hundred ninety-eight million, nine hundred ninety-one thousand, four hundred ninety-seven".