198100991111 has 8 divisors (see below), whose sum is σ = 207739350480. Its totient is φ = 188649784512.

The previous prime is 198100991063. The next prime is 198100991119. The reversal of 198100991111 is 111199001891.

It is a happy number.

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 198100991111 - 2¹⁴ = 198100974727 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 (198100991119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46786025 + ... + 46790258.

It is an arithmetic number, because the mean of its divisors is an integer number (25967418810).

Almost surely, 2^198100991111 is an apocalyptic number.

198100991111 is a deficient number, since it is larger than the sum of its proper divisors (9638359369).

198100991111 is an equidigital number, since it uses as much as digits as its factorization.

198100991111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93576385.

The product of its (nonzero) digits is 5832, while the sum is 41.

The spelling of 198100991111 in words is "one hundred ninety-eight billion, one hundred million, nine hundred ninety-one thousand, one hundred eleven".