199230809 has 2 divisors, whose sum is σ = 199230810. Its totient is φ = 199230808.

The previous prime is 199230727. The next prime is 199230821. The reversal of 199230809 is 908032991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180499225 + 18731584 = 13435^2 + 4328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199230809 is a prime.

It is not a weakly prime, because it can be changed into another prime (199230839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99615404 + 99615405.

It is an arithmetic number, because the mean of its divisors is an integer number (99615405).

Almost surely, 2^199230809 is an apocalyptic number.

It is an amenable number.

199230809 is a deficient number, since it is larger than the sum of its proper divisors (1).

199230809 is an equidigital number, since it uses as much as digits as its factorization.

199230809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 199230809 is about 14114.9144170271. The cubic root of 199230809 is about 584.0528750915.

The spelling of 199230809 in words is "one hundred ninety-nine million, two hundred thirty thousand, eight hundred nine".