309919343609 has 2 divisors, whose sum is σ = 309919343610. Its totient is φ = 309919343608.

The previous prime is 309919343561. The next prime is 309919343647. The reversal of 309919343609 is 906343919903.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279599827984 + 30319515625 = 528772^2 + 174125^2 .

It is a cyclic number.

It is not a de Polignac number, because 309919343609 - 2²⁸ = 309650908153 is a prime.

It is not a weakly prime, because it can be changed into another prime (309919340609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154959671804 + 154959671805.

It is an arithmetic number, because the mean of its divisors is an integer number (154959671805).

Almost surely, 2^309919343609 is an apocalyptic number.

It is an amenable number.

309919343609 is a deficient number, since it is larger than the sum of its proper divisors (1).

309919343609 is an equidigital number, since it uses as much as digits as its factorization.

309919343609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4251528, while the sum is 56.

The spelling of 309919343609 in words is "three hundred nine billion, nine hundred nineteen million, three hundred forty-three thousand, six hundred nine".