198911101 has 4 divisors (see below), whose sum is σ = 210611772. Its totient is φ = 187210432.

The previous prime is 198911099. The next prime is 198911123. The reversal of 198911101 is 101119891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101119891 = 23 ⋅4396517.

It can be written as a sum of positive squares in 2 ways, for example, as 151659225 + 47251876 = 12315^2 + 6874^2 .

It is a cyclic number.

It is not a de Polignac number, because 198911101 - 2¹ = 198911099 is a prime.

It is a super-2 number, since 2×198911101² = 79131252202064402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198911161) 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 3 ways as a sum of consecutive naturals, for example, 5850310 + ... + 5850343.

It is an arithmetic number, because the mean of its divisors is an integer number (52652943).

Almost surely, 2^198911101 is an apocalyptic number.

It is an amenable number.

198911101 is a deficient number, since it is larger than the sum of its proper divisors (11700671).

198911101 is a wasteful number, since it uses less digits than its factorization.

198911101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11700670.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 198911101 is about 14103.5846861711. The cubic root of 198911101 is about 583.7402956812.

The spelling of 198911101 in words is "one hundred ninety-eight million, nine hundred eleven thousand, one hundred one".