320778413 has 2 divisors, whose sum is σ = 320778414. Its totient is φ = 320778412.

The previous prime is 320778397. The next prime is 320778433. The reversal of 320778413 is 314877023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302690404 + 18088009 = 17398^2 + 4253^2 .

It is an emirp because it is prime and its reverse (314877023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320778413 - 2⁴ = 320778397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320778433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160389206 + 160389207.

It is an arithmetic number, because the mean of its divisors is an integer number (160389207).

Almost surely, 2^320778413 is an apocalyptic number.

It is an amenable number.

320778413 is a deficient number, since it is larger than the sum of its proper divisors (1).

320778413 is an equidigital number, since it uses as much as digits as its factorization.

320778413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 320778413 is about 17910.2879094670. The cubic root of 320778413 is about 684.5445410335.

The spelling of 320778413 in words is "three hundred twenty million, seven hundred seventy-eight thousand, four hundred thirteen".