199949539 has 2 divisors, whose sum is σ = 199949540. Its totient is φ = 199949538.

The previous prime is 199949537. The next prime is 199949569. The reversal of 199949539 is 935949991.

It is a weak prime.

It is an emirp because it is prime and its reverse (935949991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199949539 - 2¹ = 199949537 is a prime.

Together with 199949537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199949531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99974769 + 99974770.

It is an arithmetic number, because the mean of its divisors is an integer number (99974770).

Almost surely, 2^199949539 is an apocalyptic number.

199949539 is a deficient number, since it is larger than the sum of its proper divisors (1).

199949539 is an equidigital number, since it uses as much as digits as its factorization.

199949539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3542940, while the sum is 58.

The square root of 199949539 is about 14140.3514454203. The cubic root of 199949539 is about 584.7543605526.

The spelling of 199949539 in words is "one hundred ninety-nine million, nine hundred forty-nine thousand, five hundred thirty-nine".