75509729 has 2 divisors, whose sum is σ = 75509730. Its totient is φ = 75509728.

The previous prime is 75509671. The next prime is 75509771. The reversal of 75509729 is 92790557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68029504 + 7480225 = 8248^2 + 2735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75509729 is a prime.

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 75509729.

It is not a weakly prime, because it can be changed into another prime (75509779) 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, 37754864 + 37754865.

It is an arithmetic number, because the mean of its divisors is an integer number (37754865).

Almost surely, 2^75509729 is an apocalyptic number.

It is an amenable number.

75509729 is a deficient number, since it is larger than the sum of its proper divisors (1).

75509729 is an equidigital number, since it uses as much as digits as its factorization.

75509729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 75509729 is about 8689.6334214971. The cubic root of 75509729 is about 422.6695588236.

The spelling of 75509729 in words is "seventy-five million, five hundred nine thousand, seven hundred twenty-nine".