198116791 has 2 divisors, whose sum is σ = 198116792. Its totient is φ = 198116790.

The previous prime is 198116783. The next prime is 198116843. The reversal of 198116791 is 197611891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198116791 - 2³ = 198116783 is a prime.

It is a super-2 number, since 2×198116791² = 78500525752275362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198116731) 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 as a sum of consecutive naturals, namely, 99058395 + 99058396.

It is an arithmetic number, because the mean of its divisors is an integer number (99058396).

Almost surely, 2^198116791 is an apocalyptic number.

198116791 is a deficient number, since it is larger than the sum of its proper divisors (1).

198116791 is an equidigital number, since it uses as much as digits as its factorization.

198116791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 43.

The square root of 198116791 is about 14075.3966551568. The cubic root of 198116791 is about 582.9622440530.

The spelling of 198116791 in words is "one hundred ninety-eight million, one hundred sixteen thousand, seven hundred ninety-one".