321820349 has 2 divisors, whose sum is σ = 321820350. Its totient is φ = 321820348.

The previous prime is 321820333. The next prime is 321820361. The reversal of 321820349 is 943028123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321054724 + 765625 = 17918^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 321820349 - 2⁴ = 321820333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321820049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160910174 + 160910175.

It is an arithmetic number, because the mean of its divisors is an integer number (160910175).

Almost surely, 2^321820349 is an apocalyptic number.

It is an amenable number.

321820349 is a deficient number, since it is larger than the sum of its proper divisors (1).

321820349 is an equidigital number, since it uses as much as digits as its factorization.

321820349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 321820349 is about 17939.3519671141. The cubic root of 321820349 is about 685.2849075020.

The spelling of 321820349 in words is "three hundred twenty-one million, eight hundred twenty thousand, three hundred forty-nine".