198218911001 has 4 divisors (see below), whose sum is σ = 198224596404. Its totient is φ = 198213225600.

The previous prime is 198218910991. The next prime is 198218911013. The reversal of 198218911001 is 100119812891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100119812891 = 7 ⋅14302830413.

It can be written as a sum of positive squares in 2 ways, for example, as 136367718400 + 61851192601 = 369280^2 + 248699^2 .

It is a cyclic number.

It is not a de Polignac number, because 198218911001 - 2²² = 198214716697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198218911001.

It is not an unprimeable number, because it can be changed into a prime (198218911061) 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, 2790080 + ... + 2860241.

It is an arithmetic number, because the mean of its divisors is an integer number (49556149101).

Almost surely, 2^198218911001 is an apocalyptic number.

It is an amenable number.

198218911001 is a deficient number, since it is larger than the sum of its proper divisors (5685403).

198218911001 is an equidigital number, since it uses as much as digits as its factorization.

198218911001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685402.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 198218911001 in words is "one hundred ninety-eight billion, two hundred eighteen million, nine hundred eleven thousand, one".