198990577 has 2 divisors, whose sum is σ = 198990578. Its totient is φ = 198990576.

The previous prime is 198990557. The next prime is 198990587. The reversal of 198990577 is 775099891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116834481 + 82156096 = 10809^2 + 9064^2 .

It is an emirp because it is prime and its reverse (775099891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198990577 - 2¹¹ = 198988529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198990557) 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, 99495288 + 99495289.

It is an arithmetic number, because the mean of its divisors is an integer number (99495289).

Almost surely, 2^198990577 is an apocalyptic number.

It is an amenable number.

198990577 is a deficient number, since it is larger than the sum of its proper divisors (1).

198990577 is an equidigital number, since it uses as much as digits as its factorization.

198990577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 55.

The square root of 198990577 is about 14106.4019863323. The cubic root of 198990577 is about 583.8180308536.

The spelling of 198990577 in words is "one hundred ninety-eight million, nine hundred ninety thousand, five hundred seventy-seven".