320505349 has 2 divisors, whose sum is σ = 320505350. Its totient is φ = 320505348.

The previous prime is 320505337. The next prime is 320505371. The reversal of 320505349 is 943505023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225540324 + 94965025 = 15018^2 + 9745^2 .

It is an emirp because it is prime and its reverse (943505023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320505349 - 2⁹ = 320504837 is a prime.

It is a super-2 number, since 2×320505349² = 205447357475223602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320505349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320505329) 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, 160252674 + 160252675.

It is an arithmetic number, because the mean of its divisors is an integer number (160252675).

Almost surely, 2^320505349 is an apocalyptic number.

It is an amenable number.

320505349 is a deficient number, since it is larger than the sum of its proper divisors (1).

320505349 is an equidigital number, since it uses as much as digits as its factorization.

320505349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 320505349 is about 17902.6631817727. The cubic root of 320505349 is about 684.3502453992.

The spelling of 320505349 in words is "three hundred twenty million, five hundred five thousand, three hundred forty-nine".