329929921 has 2 divisors, whose sum is σ = 329929922. Its totient is φ = 329929920.

The previous prime is 329929913. The next prime is 329929937. The reversal of 329929921 is 129929923.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318801025 + 11128896 = 17855^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 329929921 - 2³ = 329929913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (329729921) 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, 164964960 + 164964961.

It is an arithmetic number, because the mean of its divisors is an integer number (164964961).

Almost surely, 2^329929921 is an apocalyptic number.

It is an amenable number.

329929921 is a deficient number, since it is larger than the sum of its proper divisors (1).

329929921 is an equidigital number, since it uses as much as digits as its factorization.

329929921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 46.

The square root of 329929921 is about 18163.9731611781. The cubic root of 329929921 is about 690.9934028159.

The spelling of 329929921 in words is "three hundred twenty-nine million, nine hundred twenty-nine thousand, nine hundred twenty-one".