320378129 has 2 divisors, whose sum is σ = 320378130. Its totient is φ = 320378128.

The previous prime is 320378117. The next prime is 320378147. The reversal of 320378129 is 921873023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229461904 + 90916225 = 15148^2 + 9535^2 .

It is an emirp because it is prime and its reverse (921873023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320378129 - 2⁸ = 320377873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320378159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160189064 + 160189065.

It is an arithmetic number, because the mean of its divisors is an integer number (160189065).

Almost surely, 2^320378129 is an apocalyptic number.

It is an amenable number.

320378129 is a deficient number, since it is larger than the sum of its proper divisors (1).

320378129 is an equidigital number, since it uses as much as digits as its factorization.

320378129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 320378129 is about 17899.1097264641. The cubic root of 320378129 is about 684.2596857455.

The spelling of 320378129 in words is "three hundred twenty million, three hundred seventy-eight thousand, one hundred twenty-nine".