199228409 has 2 divisors, whose sum is σ = 199228410. Its totient is φ = 199228408.

The previous prime is 199228391. The next prime is 199228439. The reversal of 199228409 is 904822991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195916009 + 3312400 = 13997^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 199228409 - 2¹² = 199224313 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199228409.

It is not a weakly prime, because it can be changed into another prime (199228439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99614204 + 99614205.

It is an arithmetic number, because the mean of its divisors is an integer number (99614205).

Almost surely, 2^199228409 is an apocalyptic number.

It is an amenable number.

199228409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199228409 is an equidigital number, since it uses as much as digits as its factorization.

199228409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 199228409 is about 14114.8294003151. The cubic root of 199228409 is about 584.0505298510.

The spelling of 199228409 in words is "one hundred ninety-nine million, two hundred twenty-eight thousand, four hundred nine".