309836312609 has 2 divisors, whose sum is σ = 309836312610. Its totient is φ = 309836312608.

The previous prime is 309836312581. The next prime is 309836312627. The reversal of 309836312609 is 906213638903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 283286869009 + 26549443600 = 532247^2 + 162940^2 .

It is a cyclic number.

It is not a de Polignac number, because 309836312609 - 2⁸ = 309836312353 is a prime.

It is a super-2 number, since 2×309836312609² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (309836312629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154918156304 + 154918156305.

It is an arithmetic number, because the mean of its divisors is an integer number (154918156305).

Almost surely, 2^309836312609 is an apocalyptic number.

It is an amenable number.

309836312609 is a deficient number, since it is larger than the sum of its proper divisors (1).

309836312609 is an equidigital number, since it uses as much as digits as its factorization.

309836312609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 309836312609 in words is "three hundred nine billion, eight hundred thirty-six million, three hundred twelve thousand, six hundred nine".