309346643 has 2 divisors, whose sum is σ = 309346644. Its totient is φ = 309346642.

The previous prime is 309346633. The next prime is 309346679. The reversal of 309346643 is 346643903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309346643 - 2⁶ = 309346579 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 309346597 and 309346606.

It is not a weakly prime, because it can be changed into another prime (309346633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154673321 + 154673322.

It is an arithmetic number, because the mean of its divisors is an integer number (154673322).

Almost surely, 2^309346643 is an apocalyptic number.

309346643 is a deficient number, since it is larger than the sum of its proper divisors (1).

309346643 is an equidigital number, since it uses as much as digits as its factorization.

309346643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 309346643 is about 17588.2529831703. The cubic root of 309346643 is about 676.3141425623.

The spelling of 309346643 in words is "three hundred nine million, three hundred forty-six thousand, six hundred forty-three".