199212347 has 2 divisors, whose sum is σ = 199212348. Its totient is φ = 199212346.

The previous prime is 199212323. The next prime is 199212383. The reversal of 199212347 is 743212991.

It is a weak prime.

It is an emirp because it is prime and its reverse (743212991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199212347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199212347.

It is not a weakly prime, because it can be changed into another prime (199212947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99606173 + 99606174.

It is an arithmetic number, because the mean of its divisors is an integer number (99606174).

Almost surely, 2^199212347 is an apocalyptic number.

199212347 is a deficient number, since it is larger than the sum of its proper divisors (1).

199212347 is an equidigital number, since it uses as much as digits as its factorization.

199212347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 199212347 is about 14114.2604127882. The cubic root of 199212347 is about 584.0348338436.

The spelling of 199212347 in words is "one hundred ninety-nine million, two hundred twelve thousand, three hundred forty-seven".