199662949 has 2 divisors, whose sum is σ = 199662950. Its totient is φ = 199662948.

The previous prime is 199662917. The next prime is 199662973. The reversal of 199662949 is 949266991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107848225 + 91814724 = 10385^2 + 9582^2 .

It is an emirp because it is prime and its reverse (949266991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199662949 - 2⁵ = 199662917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199662949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199662979) 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, 99831474 + 99831475.

It is an arithmetic number, because the mean of its divisors is an integer number (99831475).

Almost surely, 2^199662949 is an apocalyptic number.

It is an amenable number.

199662949 is a deficient number, since it is larger than the sum of its proper divisors (1).

199662949 is an equidigital number, since it uses as much as digits as its factorization.

199662949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 55.

The square root of 199662949 is about 14130.2140465033. The cubic root of 199662949 is about 584.4748485585.

The spelling of 199662949 in words is "one hundred ninety-nine million, six hundred sixty-two thousand, nine hundred forty-nine".