198645099 has 16 divisors (see below), whose sum is σ = 274375200. Its totient is φ = 127685376.

The previous prime is 198645091. The next prime is 198645101. The reversal of 198645099 is 990546891.

It is not a de Polignac number, because 198645099 - 2³ = 198645091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198645091) 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 15 ways as a sum of consecutive naturals, for example, 94047 + ... + 96135.

It is an arithmetic number, because the mean of its divisors is an integer number (17148450).

Almost surely, 2^198645099 is an apocalyptic number.

198645099 is a deficient number, since it is larger than the sum of its proper divisors (75730101).

198645099 is a wasteful number, since it uses less digits than its factorization.

198645099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 198645099 is about 14094.1512337565. The cubic root of 198645099 is about 583.4799694127.

The spelling of 198645099 in words is "one hundred ninety-eight million, six hundred forty-five thousand, ninety-nine".