623321 has 2 divisors, whose sum is σ = 623322. Its totient is φ = 623320.

The previous prime is 623303. The next prime is 623327. The reversal of 623321 is 123326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373321 + 250000 = 611^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623321 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 623321.

It is not a weakly prime, because it can be changed into another prime (623327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311660 + 311661.

It is an arithmetic number, because the mean of its divisors is an integer number (311661).

2⁶²³³²¹ is an apocalyptic number.

It is an amenable number.

623321 is a deficient number, since it is larger than the sum of its proper divisors (1).

623321 is an equidigital number, since it uses as much as digits as its factorization.

623321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 17.

The square root of 623321 is about 789.5068080770. The cubic root of 623321 is about 85.4221673502.

Adding to 623321 its reverse (123326), we get a palindrome (746647).

The spelling of 623321 in words is "six hundred twenty-three thousand, three hundred twenty-one".