198971611 has 2 divisors, whose sum is σ = 198971612. Its totient is φ = 198971610.

The previous prime is 198971603. The next prime is 198971623. The reversal of 198971611 is 116179891.

It is a weak prime.

It is an emirp because it is prime and its reverse (116179891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198971611 - 2³ = 198971603 is a prime.

It is not a weakly prime, because it can be changed into another prime (198971651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99485805 + 99485806.

It is an arithmetic number, because the mean of its divisors is an integer number (99485806).

Almost surely, 2^198971611 is an apocalyptic number.

198971611 is a deficient number, since it is larger than the sum of its proper divisors (1).

198971611 is an equidigital number, since it uses as much as digits as its factorization.

198971611 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 198971611 is about 14105.7297223504. The cubic root of 198971611 is about 583.7994821620.

The spelling of 198971611 in words is "one hundred ninety-eight million, nine hundred seventy-one thousand, six hundred eleven".