198722789 has 2 divisors, whose sum is σ = 198722790. Its totient is φ = 198722788.

The previous prime is 198722701. The next prime is 198722791. The reversal of 198722789 is 987227891.

It is a happy number.

198722789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182385025 + 16337764 = 13505^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 198722789 - 2¹² = 198718693 is a prime.

Together with 198722791, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198722789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198722189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99361394 + 99361395.

It is an arithmetic number, because the mean of its divisors is an integer number (99361395).

Almost surely, 2^198722789 is an apocalyptic number.

It is an amenable number.

198722789 is a deficient number, since it is larger than the sum of its proper divisors (1).

198722789 is an equidigital number, since it uses as much as digits as its factorization.

198722789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 198722789 is about 14096.9070721205. The cubic root of 198722789 is about 583.5560257409.

The spelling of 198722789 in words is "one hundred ninety-eight million, seven hundred twenty-two thousand, seven hundred eighty-nine".