1722313321 has 2 divisors, whose sum is σ = 1722313322. Its totient is φ = 1722313320.

The previous prime is 1722313319. The next prime is 1722313339. The reversal of 1722313321 is 1233132271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1257695296 + 464618025 = 35464^2 + 21555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722313321 - 2¹ = 1722313319 is a prime.

Together with 1722313319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1722313381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861156660 + 861156661.

It is an arithmetic number, because the mean of its divisors is an integer number (861156661).

Almost surely, 2^1722313321 is an apocalyptic number.

It is an amenable number.

1722313321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722313321 is an equidigital number, since it uses as much as digits as its factorization.

1722313321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 1722313321 is about 41500.7628966023. The cubic root of 1722313321 is about 1198.6821924695.

Adding to 1722313321 its reverse (1233132271), we get a palindrome (2955445592).

The spelling of 1722313321 in words is "one billion, seven hundred twenty-two million, three hundred thirteen thousand, three hundred twenty-one".