75018809 has 2 divisors, whose sum is σ = 75018810. Its totient is φ = 75018808.

The previous prime is 75018787. The next prime is 75018829. The reversal of 75018809 is 90881057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74874409 + 144400 = 8653^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 75018809 - 2¹⁶ = 74953273 is a prime.

It is a super-3 number, since 3×75018809³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75018829) 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, 37509404 + 37509405.

It is an arithmetic number, because the mean of its divisors is an integer number (37509405).

Almost surely, 2^75018809 is an apocalyptic number.

It is an amenable number.

75018809 is a deficient number, since it is larger than the sum of its proper divisors (1).

75018809 is an equidigital number, since it uses as much as digits as its factorization.

75018809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 75018809 is about 8661.3399078895. The cubic root of 75018809 is about 421.7515833154.

The spelling of 75018809 in words is "seventy-five million, eighteen thousand, eight hundred nine".