199268609 has 2 divisors, whose sum is σ = 199268610. Its totient is φ = 199268608.

The previous prime is 199268591. The next prime is 199268617. The reversal of 199268609 is 906862991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139901584 + 59367025 = 11828^2 + 7705^2 .

It is a cyclic number.

It is not a de Polignac number, because 199268609 - 2⁸ = 199268353 is a prime.

It is not a weakly prime, because it can be changed into another prime (199268659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99634304 + 99634305.

It is an arithmetic number, because the mean of its divisors is an integer number (99634305).

Almost surely, 2^199268609 is an apocalyptic number.

It is an amenable number.

199268609 is a deficient number, since it is larger than the sum of its proper divisors (1).

199268609 is an equidigital number, since it uses as much as digits as its factorization.

199268609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 199268609 is about 14116.2533627022. The cubic root of 199268609 is about 584.0898101464.

The spelling of 199268609 in words is "one hundred ninety-nine million, two hundred sixty-eight thousand, six hundred nine".