198022001 has 4 divisors (see below), whose sum is σ = 209670372. Its totient is φ = 186373632.

The previous prime is 198021979. The next prime is 198022003. The reversal of 198022001 is 100220891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100220891 = 733 ⋅136727.

It can be written as a sum of positive squares in 2 ways, for example, as 116661601 + 81360400 = 10801^2 + 9020^2 .

It is a cyclic number.

It is not a de Polignac number, because 198022001 - 2⁶ = 198021937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198022003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5824160 + ... + 5824193.

It is an arithmetic number, because the mean of its divisors is an integer number (52417593).

Almost surely, 2^198022001 is an apocalyptic number.

It is an amenable number.

198022001 is a deficient number, since it is larger than the sum of its proper divisors (11648371).

198022001 is a wasteful number, since it uses less digits than its factorization.

198022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11648370.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 198022001 is about 14072.0290292481. The cubic root of 198022001 is about 582.8692554575.

Adding to 198022001 its reverse (100220891), we get a palindrome (298242892).

The spelling of 198022001 in words is "one hundred ninety-eight million, twenty-two thousand, one".