199212889 has 2 divisors, whose sum is σ = 199212890. Its totient is φ = 199212888.

The previous prime is 199212833. The next prime is 199212917. The reversal of 199212889 is 988212991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188375625 + 10837264 = 13725^2 + 3292^2 .

It is an emirp because it is prime and its reverse (988212991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199212889 - 2¹³ = 199204697 is a prime.

It is not a weakly prime, because it can be changed into another prime (199212089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99606444 + 99606445.

It is an arithmetic number, because the mean of its divisors is an integer number (99606445).

Almost surely, 2^199212889 is an apocalyptic number.

It is an amenable number.

199212889 is a deficient number, since it is larger than the sum of its proper divisors (1).

199212889 is an equidigital number, since it uses as much as digits as its factorization.

199212889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 49.

The square root of 199212889 is about 14114.2796132144. The cubic root of 199212889 is about 584.0353635072.

The spelling of 199212889 in words is "one hundred ninety-nine million, two hundred twelve thousand, eight hundred eighty-nine".