328721501 has 2 divisors, whose sum is σ = 328721502. Its totient is φ = 328721500.

The previous prime is 328721483. The next prime is 328721531. The reversal of 328721501 is 105127823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168091225 + 160630276 = 12965^2 + 12674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328721501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328721531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164360750 + 164360751.

It is an arithmetic number, because the mean of its divisors is an integer number (164360751).

Almost surely, 2^328721501 is an apocalyptic number.

It is an amenable number.

328721501 is a deficient number, since it is larger than the sum of its proper divisors (1).

328721501 is an equidigital number, since it uses as much as digits as its factorization.

328721501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 328721501 is about 18130.6784484200. The cubic root of 328721501 is about 690.1487468996.

The spelling of 328721501 in words is "three hundred twenty-eight million, seven hundred twenty-one thousand, five hundred one".