320621347 has 2 divisors, whose sum is σ = 320621348. Its totient is φ = 320621346.

The previous prime is 320621299. The next prime is 320621359. The reversal of 320621347 is 743126023.

It is a strong prime.

It is an emirp because it is prime and its reverse (743126023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320621347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320921347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160310673 + 160310674.

It is an arithmetic number, because the mean of its divisors is an integer number (160310674).

Almost surely, 2^320621347 is an apocalyptic number.

320621347 is a deficient number, since it is larger than the sum of its proper divisors (1).

320621347 is an equidigital number, since it uses as much as digits as its factorization.

320621347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 320621347 is about 17905.9025742910. The cubic root of 320621347 is about 684.4327959557.

The spelling of 320621347 in words is "three hundred twenty million, six hundred twenty-one thousand, three hundred forty-seven".