199993289 has 2 divisors, whose sum is σ = 199993290. Its totient is φ = 199993288.

The previous prime is 199993279. The next prime is 199993331. The reversal of 199993289 is 982399991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 80856064 = 10915^2 + 8992^2 .

It is a cyclic number.

It is not a de Polignac number, because 199993289 - 2⁴ = 199993273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199993249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99996644 + 99996645.

It is an arithmetic number, because the mean of its divisors is an integer number (99996645).

Almost surely, 2^199993289 is an apocalyptic number.

It is an amenable number.

199993289 is a deficient number, since it is larger than the sum of its proper divisors (1).

199993289 is an equidigital number, since it uses as much as digits as its factorization.

199993289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 59.

The square root of 199993289 is about 14141.8983520601. The cubic root of 199993289 is about 584.7970065417.

The spelling of 199993289 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, two hundred eighty-nine".