329690321 has 2 divisors, whose sum is σ = 329690322. Its totient is φ = 329690320.

The previous prime is 329690287. The next prime is 329690323. The reversal of 329690321 is 123096923.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263088400 + 66601921 = 16220^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 329690321 - 2¹⁴ = 329673937 is a prime.

It is a super-2 number, since 2×329690321² = 217391415522166082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 329690323, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (329690323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164845160 + 164845161.

It is an arithmetic number, because the mean of its divisors is an integer number (164845161).

Almost surely, 2^329690321 is an apocalyptic number.

It is an amenable number.

329690321 is a deficient number, since it is larger than the sum of its proper divisors (1).

329690321 is an equidigital number, since it uses as much as digits as its factorization.

329690321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 329690321 is about 18157.3764900109. The cubic root of 329690321 is about 690.8260924238.

The spelling of 329690321 in words is "three hundred twenty-nine million, six hundred ninety thousand, three hundred twenty-one".