199228789 has 2 divisors, whose sum is σ = 199228790. Its totient is φ = 199228788.

The previous prime is 199228787. The next prime is 199228793. The reversal of 199228789 is 987822991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126382564 + 72846225 = 11242^2 + 8535^2 .

It is a cyclic number.

It is not a de Polignac number, because 199228789 - 2¹ = 199228787 is a prime.

It is a super-2 number, since 2×199228789² = 79384220732813042, which contains 22 as substring.

Together with 199228787, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199228787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99614394 + 99614395.

It is an arithmetic number, because the mean of its divisors is an integer number (99614395).

Almost surely, 2^199228789 is an apocalyptic number.

It is an amenable number.

199228789 is a deficient number, since it is larger than the sum of its proper divisors (1).

199228789 is an equidigital number, since it uses as much as digits as its factorization.

199228789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 199228789 is about 14114.8428613286. The cubic root of 199228789 is about 584.0509011820.

The spelling of 199228789 in words is "one hundred ninety-nine million, two hundred twenty-eight thousand, seven hundred eighty-nine".