342509309 has 2 divisors, whose sum is σ = 342509310. Its totient is φ = 342509308.

The previous prime is 342509287. The next prime is 342509347. The reversal of 342509309 is 903905243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315240025 + 27269284 = 17755^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 342509309 - 2²⁰ = 341460733 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 (342509509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171254654 + 171254655.

It is an arithmetic number, because the mean of its divisors is an integer number (171254655).

Almost surely, 2^342509309 is an apocalyptic number.

It is an amenable number.

342509309 is a deficient number, since it is larger than the sum of its proper divisors (1).

342509309 is an equidigital number, since it uses as much as digits as its factorization.

342509309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 342509309 is about 18507.0070243678. The cubic root of 342509309 is about 699.6660372939. Note that the first 3 decimals are identical.

The spelling of 342509309 in words is "three hundred forty-two million, five hundred nine thousand, three hundred nine".