199331917 has 2 divisors, whose sum is σ = 199331918. Its totient is φ = 199331916.

The previous prime is 199331903. The next prime is 199331921. The reversal of 199331917 is 719133991.

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., 145588356 + 53743561 = 12066^2 + 7331^2 .

It is an emirp because it is prime and its reverse (719133991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199331917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199331927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99665958 + 99665959.

It is an arithmetic number, because the mean of its divisors is an integer number (99665959).

Almost surely, 2^199331917 is an apocalyptic number.

It is an amenable number.

199331917 is a deficient number, since it is larger than the sum of its proper divisors (1).

199331917 is an equidigital number, since it uses as much as digits as its factorization.

199331917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45927, while the sum is 43.

The square root of 199331917 is about 14118.4955643298. The cubic root of 199331917 is about 584.1516590625.

The spelling of 199331917 in words is "one hundred ninety-nine million, three hundred thirty-one thousand, nine hundred seventeen".