195953729 has 2 divisors, whose sum is σ = 195953730. Its totient is φ = 195953728.

The previous prime is 195953711. The next prime is 195953731. The reversal of 195953729 is 927359591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145926400 + 50027329 = 12080^2 + 7073^2 .

It is a cyclic number.

It is not a de Polignac number, because 195953729 - 2¹⁶ = 195888193 is a prime.

It is a Sophie Germain prime.

Together with 195953731, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (195953789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97976864 + 97976865.

It is an arithmetic number, because the mean of its divisors is an integer number (97976865).

Almost surely, 2^195953729 is an apocalyptic number.

It is an amenable number.

195953729 is a deficient number, since it is larger than the sum of its proper divisors (1).

195953729 is an equidigital number, since it uses as much as digits as its factorization.

195953729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 765450, while the sum is 50.

The square root of 195953729 is about 13998.3473667430. The cubic root of 195953729 is about 580.8328591594.

The spelling of 195953729 in words is "one hundred ninety-five million, nine hundred fifty-three thousand, seven hundred twenty-nine".