198518849 has 2 divisors, whose sum is σ = 198518850. Its totient is φ = 198518848.

The previous prime is 198518797. The next prime is 198518899. The reversal of 198518849 is 948815891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 37736449 = 12680^2 + 6143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198518849 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198518849.

It is not a weakly prime, because it can be changed into another prime (198518899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99259424 + 99259425.

It is an arithmetic number, because the mean of its divisors is an integer number (99259425).

Almost surely, 2^198518849 is an apocalyptic number.

It is an amenable number.

198518849 is a deficient number, since it is larger than the sum of its proper divisors (1).

198518849 is an equidigital number, since it uses as much as digits as its factorization.

198518849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 53.

The square root of 198518849 is about 14089.6717137058. The cubic root of 198518849 is about 583.3563319005.

The spelling of 198518849 in words is "one hundred ninety-eight million, five hundred eighteen thousand, eight hundred forty-nine".