320121313 has 2 divisors, whose sum is σ = 320121314. Its totient is φ = 320121312.

The previous prime is 320121293. The next prime is 320121349. The reversal of 320121313 is 313121023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291316624 + 28804689 = 17068^2 + 5367^2 .

It is a cyclic number.

It is not a de Polignac number, because 320121313 - 2⁵ = 320121281 is a prime.

It is not a weakly prime, because it can be changed into another prime (320121353) 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, 160060656 + 160060657.

It is an arithmetic number, because the mean of its divisors is an integer number (160060657).

Almost surely, 2^320121313 is an apocalyptic number.

It is an amenable number.

320121313 is a deficient number, since it is larger than the sum of its proper divisors (1).

320121313 is an equidigital number, since it uses as much as digits as its factorization.

320121313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320121313 is about 17891.9343001253. The cubic root of 320121313 is about 684.0768020471.

Adding to 320121313 its reverse (313121023), we get a palindrome (633242336).

The spelling of 320121313 in words is "three hundred twenty million, one hundred twenty-one thousand, three hundred thirteen".