320778371 has 2 divisors, whose sum is σ = 320778372. Its totient is φ = 320778370.

The previous prime is 320778361. The next prime is 320778397. The reversal of 320778371 is 173877023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320778371 - 2⁶ = 320778307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320778361) 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, 160389185 + 160389186.

It is an arithmetic number, because the mean of its divisors is an integer number (160389186).

Almost surely, 2^320778371 is an apocalyptic number.

320778371 is a deficient number, since it is larger than the sum of its proper divisors (1).

320778371 is an equidigital number, since it uses as much as digits as its factorization.

320778371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 320778371 is about 17910.2867369565. The cubic root of 320778371 is about 684.5445111574.

The spelling of 320778371 in words is "three hundred twenty million, seven hundred seventy-eight thousand, three hundred seventy-one".