75252809 has 2 divisors, whose sum is σ = 75252810. Its totient is φ = 75252808.

The previous prime is 75252799. The next prime is 75252811. The reversal of 75252809 is 90825257.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43296400 + 31956409 = 6580^2 + 5653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75252809 is a prime.

It is a super-3 number, since 3×75252809³ (a number of 25 digits) contains 333 as substring.

Together with 75252811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75252869) 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, 37626404 + 37626405.

It is an arithmetic number, because the mean of its divisors is an integer number (37626405).

Almost surely, 2^75252809 is an apocalyptic number.

It is an amenable number.

75252809 is a deficient number, since it is larger than the sum of its proper divisors (1).

75252809 is an equidigital number, since it uses as much as digits as its factorization.

75252809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 75252809 is about 8674.8376930061. The cubic root of 75252809 is about 422.1896398398.

The spelling of 75252809 in words is "seventy-five million, two hundred fifty-two thousand, eight hundred nine".