198013945271 has 4 divisors (see below), whose sum is σ = 198225273792. Its totient is φ = 197802616752.

The previous prime is 198013945243. The next prime is 198013945277. The reversal of 198013945271 is 172549310891.

198013945271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172549310891 = 359 ⋅480638749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198013945271 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 (198013945277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105662855 + ... + 105664728.

It is an arithmetic number, because the mean of its divisors is an integer number (49556318448).

Almost surely, 2^198013945271 is an apocalyptic number.

198013945271 is a deficient number, since it is larger than the sum of its proper divisors (211328521).

198013945271 is an equidigital number, since it uses as much as digits as its factorization.

198013945271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211328520.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 198013945271 in words is "one hundred ninety-eight billion, thirteen million, nine hundred forty-five thousand, two hundred seventy-one".