75975209 has 2 divisors, whose sum is σ = 75975210. Its totient is φ = 75975208.

The previous prime is 75975191. The next prime is 75975223. The reversal of 75975209 is 90257957.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 29735209 = 6800^2 + 5453^2 .

It is a cyclic number.

It is not a de Polignac number, because 75975209 - 2⁸ = 75974953 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 75975209.

It is not a weakly prime, because it can be changed into another prime (75975259) 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, 37987604 + 37987605.

It is an arithmetic number, because the mean of its divisors is an integer number (37987605).

Almost surely, 2^75975209 is an apocalyptic number.

It is an amenable number.

75975209 is a deficient number, since it is larger than the sum of its proper divisors (1).

75975209 is an equidigital number, since it uses as much as digits as its factorization.

75975209 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 75975209 is about 8716.3759097460. The cubic root of 75975209 is about 423.5362962665.

The spelling of 75975209 in words is "seventy-five million, nine hundred seventy-five thousand, two hundred nine".