309829109 has 2 divisors, whose sum is σ = 309829110. Its totient is φ = 309829108.

The previous prime is 309829099. The next prime is 309829139. The reversal of 309829109 is 901928903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301126609 + 8702500 = 17353^2 + 2950^2 .

It is an emirp because it is prime and its reverse (901928903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309829109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309829139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154914554 + 154914555.

It is an arithmetic number, because the mean of its divisors is an integer number (154914555).

Almost surely, 2^309829109 is an apocalyptic number.

It is an amenable number.

309829109 is a deficient number, since it is larger than the sum of its proper divisors (1).

309829109 is an equidigital number, since it uses as much as digits as its factorization.

309829109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 309829109 is about 17601.9632143690. The cubic root of 309829109 is about 676.6655596521.

The spelling of 309829109 in words is "three hundred nine million, eight hundred twenty-nine thousand, one hundred nine".