75434209 has 2 divisors, whose sum is σ = 75434210. Its totient is φ = 75434208.

The previous prime is 75434207. The next prime is 75434221. The reversal of 75434209 is 90243457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75342400 + 91809 = 8680^2 + 303^2 .

It is an emirp because it is prime and its reverse (90243457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75434209 - 2¹ = 75434207 is a prime.

Together with 75434207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (75434207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37717104 + 37717105.

It is an arithmetic number, because the mean of its divisors is an integer number (37717105).

Almost surely, 2^75434209 is an apocalyptic number.

It is an amenable number.

75434209 is a deficient number, since it is larger than the sum of its proper divisors (1).

75434209 is an equidigital number, since it uses as much as digits as its factorization.

75434209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 75434209 is about 8685.2869267515. The cubic root of 75434209 is about 422.5286028043.

The spelling of 75434209 in words is "seventy-five million, four hundred thirty-four thousand, two hundred nine".