321668933 has 2 divisors, whose sum is σ = 321668934. Its totient is φ = 321668932.

The previous prime is 321668891. The next prime is 321668947. The reversal of 321668933 is 339866123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307546369 + 14122564 = 17537^2 + 3758^2 .

It is an emirp because it is prime and its reverse (339866123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321668933 - 2¹⁶ = 321603397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321668983) 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, 160834466 + 160834467.

It is an arithmetic number, because the mean of its divisors is an integer number (160834467).

Almost surely, 2^321668933 is an apocalyptic number.

It is an amenable number.

321668933 is a deficient number, since it is larger than the sum of its proper divisors (1).

321668933 is an equidigital number, since it uses as much as digits as its factorization.

321668933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 41.

The square root of 321668933 is about 17935.1312512621. The cubic root of 321668933 is about 685.1774154622.

The spelling of 321668933 in words is "three hundred twenty-one million, six hundred sixty-eight thousand, nine hundred thirty-three".