199768949 has 2 divisors, whose sum is σ = 199768950. Its totient is φ = 199768948.

The previous prime is 199768903. The next prime is 199768951. The reversal of 199768949 is 949867991.

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., 168610225 + 31158724 = 12985^2 + 5582^2 .

It is a cyclic number.

It is not a de Polignac number, because 199768949 - 2⁸ = 199768693 is a prime.

Together with 199768951, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 199768891 and 199768900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199768969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99884474 + 99884475.

It is an arithmetic number, because the mean of its divisors is an integer number (99884475).

Almost surely, 2^199768949 is an apocalyptic number.

It is an amenable number.

199768949 is a deficient number, since it is larger than the sum of its proper divisors (1).

199768949 is an equidigital number, since it uses as much as digits as its factorization.

199768949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 62.

The square root of 199768949 is about 14133.9643766355. The cubic root of 199768949 is about 584.5782617919.

The spelling of 199768949 in words is "one hundred ninety-nine million, seven hundred sixty-eight thousand, nine hundred forty-nine".