323231621 has 2 divisors, whose sum is σ = 323231622. Its totient is φ = 323231620.

The previous prime is 323231617. The next prime is 323231639. The reversal of 323231621 is 126132323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248409121 + 74822500 = 15761^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 323231621 - 2² = 323231617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323231611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161615810 + 161615811.

It is an arithmetic number, because the mean of its divisors is an integer number (161615811).

Almost surely, 2^323231621 is an apocalyptic number.

It is an amenable number.

323231621 is a deficient number, since it is larger than the sum of its proper divisors (1).

323231621 is an equidigital number, since it uses as much as digits as its factorization.

323231621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 323231621 is about 17978.6434694056. The cubic root of 323231621 is about 686.2851686074.

Adding to 323231621 its reverse (126132323), we get a palindrome (449363944).

The spelling of 323231621 in words is "three hundred twenty-three million, two hundred thirty-one thousand, six hundred twenty-one".