320748161 has 2 divisors, whose sum is σ = 320748162. Its totient is φ = 320748160.

The previous prime is 320748157. The next prime is 320748193. The reversal of 320748161 is 161847023.

It is an a-pointer prime, because the next prime (320748193) can be obtained adding 320748161 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178089025 + 142659136 = 13345^2 + 11944^2 .

It is a cyclic number.

It is not a de Polignac number, because 320748161 - 2² = 320748157 is a prime.

It is not a weakly prime, because it can be changed into another prime (320748121) 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, 160374080 + 160374081.

It is an arithmetic number, because the mean of its divisors is an integer number (160374081).

Almost surely, 2^320748161 is an apocalyptic number.

It is an amenable number.

320748161 is a deficient number, since it is larger than the sum of its proper divisors (1).

320748161 is an equidigital number, since it uses as much as digits as its factorization.

320748161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 320748161 is about 17909.4433470167. The cubic root of 320748161 is about 684.5230209939.

The spelling of 320748161 in words is "three hundred twenty million, seven hundred forty-eight thousand, one hundred sixty-one".