199545649 has 2 divisors, whose sum is σ = 199545650. Its totient is φ = 199545648.

The previous prime is 199545629. The next prime is 199545653. The reversal of 199545649 is 946545991.

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., 103897249 + 95648400 = 10193^2 + 9780^2 .

It is an emirp because it is prime and its reverse (946545991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199545649 - 2⁵ = 199545617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199545596 and 199545605.

It is not a weakly prime, because it can be changed into another prime (199545629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99772824 + 99772825.

It is an arithmetic number, because the mean of its divisors is an integer number (99772825).

Almost surely, 2^199545649 is an apocalyptic number.

It is an amenable number.

199545649 is a deficient number, since it is larger than the sum of its proper divisors (1).

199545649 is an equidigital number, since it uses as much as digits as its factorization.

199545649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 52.

The square root of 199545649 is about 14126.0627564796. The cubic root of 199545649 is about 584.3603684136.

The spelling of 199545649 in words is "one hundred ninety-nine million, five hundred forty-five thousand, six hundred forty-nine".