195788249 has 2 divisors, whose sum is σ = 195788250. Its totient is φ = 195788248.

The previous prime is 195788239. The next prime is 195788287. The reversal of 195788249 is 942887591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154828249 + 40960000 = 12443^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 195788249 - 2⁴ = 195788233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 195788249.

It is not a weakly prime, because it can be changed into another prime (195788239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97894124 + 97894125.

It is an arithmetic number, because the mean of its divisors is an integer number (97894125).

Almost surely, 2^195788249 is an apocalyptic number.

It is an amenable number.

195788249 is a deficient number, since it is larger than the sum of its proper divisors (1).

195788249 is an equidigital number, since it uses as much as digits as its factorization.

195788249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 195788249 is about 13992.4354206121. The cubic root of 195788249 is about 580.6693115522.

The spelling of 195788249 in words is "one hundred ninety-five million, seven hundred eighty-eight thousand, two hundred forty-nine".