722321 has 2 divisors, whose sum is σ = 722322. Its totient is φ = 722320.

The previous prime is 722317. The next prime is 722333. The reversal of 722321 is 123227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 180625 = 736^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 722321 - 2² = 722317 is a prime.

It is equal to p₅₈₂₁₁ and since 722321 and 58211 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722321.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722321.

It is not a weakly prime, because it can be changed into another prime (722311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361160 + 361161.

It is an arithmetic number, because the mean of its divisors is an integer number (361161).

2⁷²²³²¹ is an apocalyptic number.

It is an amenable number.

722321 is a deficient number, since it is larger than the sum of its proper divisors (1).

722321 is an equidigital number, since it uses as much as digits as its factorization.

722321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 17.

The square root of 722321 is about 849.8946993599. The cubic root of 722321 is about 89.7243003364.

Adding to 722321 its reverse (123227), we get a palindrome (845548).

The spelling of 722321 in words is "seven hundred twenty-two thousand, three hundred twenty-one", and thus it is an iban number.