195663449 has 2 divisors, whose sum is σ = 195663450.
Its totient is φ = 195663448.
The previous prime is 195663443. The next prime is 195663469. The reversal of 195663449 is 944366591.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 136142224 + 59521225 = 11668^2 + 7715^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-195663449 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (195663443) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97831724 + 97831725.
It is an arithmetic number, because the mean of its divisors is an integer number (97831725).
Almost surely, 2195663449 is an apocalyptic number.
It is an amenable number.
195663449 is a deficient number, since it is larger than the sum of its proper divisors (1).
195663449 is an equidigital number, since it uses as much as digits as its factorization.
195663449 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 699840, while the sum is 47.
The square root of 195663449 is about 13987.9751572556.
The cubic root of 195663449 is about 580.5459079374.
The spelling of 195663449 in words is "one hundred ninety-five million, six hundred sixty-three thousand, four hundred forty-nine".