75308809 has 2 divisors, whose sum is σ = 75308810. Its totient is φ = 75308808.

The previous prime is 75308797. The next prime is 75308833. The reversal of 75308809 is 90880357.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51883209 + 23425600 = 7203^2 + 4840^2 .

It is an emirp because it is prime and its reverse (90880357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75308809 - 2⁹ = 75308297 is a prime.

It is not a weakly prime, because it can be changed into another prime (75308879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37654404 + 37654405.

It is an arithmetic number, because the mean of its divisors is an integer number (37654405).

Almost surely, 2^75308809 is an apocalyptic number.

It is an amenable number.

75308809 is a deficient number, since it is larger than the sum of its proper divisors (1).

75308809 is an equidigital number, since it uses as much as digits as its factorization.

75308809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 75308809 is about 8678.0648188407. The cubic root of 75308809 is about 422.2943391768.

The spelling of 75308809 in words is "seventy-five million, three hundred eight thousand, eight hundred nine".