199861241 has 2 divisors, whose sum is σ = 199861242. Its totient is φ = 199861240.

The previous prime is 199861223. The next prime is 199861267. The reversal of 199861241 is 142168991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193210000 + 6651241 = 13900^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 199861241 - 2⁶ = 199861177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199861141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99930620 + 99930621.

It is an arithmetic number, because the mean of its divisors is an integer number (99930621).

Almost surely, 2^199861241 is an apocalyptic number.

It is an amenable number.

199861241 is a deficient number, since it is larger than the sum of its proper divisors (1).

199861241 is an equidigital number, since it uses as much as digits as its factorization.

199861241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 199861241 is about 14137.2289010258. The cubic root of 199861241 is about 584.6682717607.

The spelling of 199861241 in words is "one hundred ninety-nine million, eight hundred sixty-one thousand, two hundred forty-one".