199987241 has 2 divisors, whose sum is σ = 199987242. Its totient is φ = 199987240.

The previous prime is 199987237. The next prime is 199987253. The reversal of 199987241 is 142789991.

199987241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118897216 + 81090025 = 10904^2 + 9005^2 .

It is an emirp because it is prime and its reverse (142789991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199987241 - 2² = 199987237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199987241.

It is not a weakly prime, because it can be changed into another prime (199987261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99993620 + 99993621.

It is an arithmetic number, because the mean of its divisors is an integer number (99993621).

Almost surely, 2^199987241 is an apocalyptic number.

It is an amenable number.

199987241 is a deficient number, since it is larger than the sum of its proper divisors (1).

199987241 is an equidigital number, since it uses as much as digits as its factorization.

199987241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 50.

The square root of 199987241 is about 14141.6845177652. The cubic root of 199987241 is about 584.7911115307.

The spelling of 199987241 in words is "one hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred forty-one".