199183561 has 2 divisors, whose sum is σ = 199183562. Its totient is φ = 199183560.

The previous prime is 199183559. The next prime is 199183591. The reversal of 199183561 is 165381991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 58049161 = 11880^2 + 7619^2 .

It is an emirp because it is prime and its reverse (165381991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199183561 - 2¹ = 199183559 is a prime.

Together with 199183559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199183511) 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, 99591780 + 99591781.

It is an arithmetic number, because the mean of its divisors is an integer number (99591781).

Almost surely, 2^199183561 is an apocalyptic number.

It is an amenable number.

199183561 is a deficient number, since it is larger than the sum of its proper divisors (1).

199183561 is an equidigital number, since it uses as much as digits as its factorization.

199183561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 199183561 is about 14113.2406271558. The cubic root of 199183561 is about 584.0067016573.

The spelling of 199183561 in words is "one hundred ninety-nine million, one hundred eighty-three thousand, five hundred sixty-one".