321820049 has 2 divisors, whose sum is σ = 321820050. Its totient is φ = 321820048.

The previous prime is 321820039. The next prime is 321820069. The reversal of 321820049 is 940028123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306075025 + 15745024 = 17495^2 + 3968^2 .

It is an emirp because it is prime and its reverse (940028123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321820049 - 2⁸ = 321819793 is a prime.

It is not a weakly prime, because it can be changed into another prime (321820039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160910024 + 160910025.

It is an arithmetic number, because the mean of its divisors is an integer number (160910025).

Almost surely, 2^321820049 is an apocalyptic number.

It is an amenable number.

321820049 is a deficient number, since it is larger than the sum of its proper divisors (1).

321820049 is an equidigital number, since it uses as much as digits as its factorization.

321820049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 321820049 is about 17939.3436056061. The cubic root of 321820049 is about 685.2846945617.

The spelling of 321820049 in words is "three hundred twenty-one million, eight hundred twenty thousand, forty-nine".