309134120809 has 2 divisors, whose sum is σ = 309134120810. Its totient is φ = 309134120808.

The previous prime is 309134120791. The next prime is 309134120837. The reversal of 309134120809 is 908021431903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302139307584 + 6994813225 = 549672^2 + 83635^2 .

It is a cyclic number.

It is not a de Polignac number, because 309134120809 - 2⁷ = 309134120681 is a prime.

It is not a weakly prime, because it can be changed into another prime (309134120899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154567060404 + 154567060405.

It is an arithmetic number, because the mean of its divisors is an integer number (154567060405).

Almost surely, 2^309134120809 is an apocalyptic number.

It is an amenable number.

309134120809 is a deficient number, since it is larger than the sum of its proper divisors (1).

309134120809 is an equidigital number, since it uses as much as digits as its factorization.

309134120809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 309134120809 in words is "three hundred nine billion, one hundred thirty-four million, one hundred twenty thousand, eight hundred nine".