320403121 has 2 divisors, whose sum is σ = 320403122. Its totient is φ = 320403120.

The previous prime is 320403119. The next prime is 320403143. The reversal of 320403121 is 121304023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215032896 + 105370225 = 14664^2 + 10265^2 .

It is a cyclic number.

It is not a de Polignac number, because 320403121 - 2¹ = 320403119 is a prime.

Together with 320403119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 320403095 and 320403104.

It is not a weakly prime, because it can be changed into another prime (320409121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160201560 + 160201561.

It is an arithmetic number, because the mean of its divisors is an integer number (160201561).

Almost surely, 2^320403121 is an apocalyptic number.

It is an amenable number.

320403121 is a deficient number, since it is larger than the sum of its proper divisors (1).

320403121 is an equidigital number, since it uses as much as digits as its factorization.

320403121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 320403121 is about 17899.8078481307. The cubic root of 320403121 is about 684.2774778187.

Adding to 320403121 its reverse (121304023), we get a palindrome (441707144).

The spelling of 320403121 in words is "three hundred twenty million, four hundred three thousand, one hundred twenty-one".