320256121 has 2 divisors, whose sum is σ = 320256122. Its totient is φ = 320256120.

The previous prime is 320256113. The next prime is 320256169. The reversal of 320256121 is 121652023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208658025 + 111598096 = 14445^2 + 10564^2 .

It is an emirp because it is prime and its reverse (121652023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320256121 - 2³ = 320256113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320256092 and 320256101.

It is not a weakly prime, because it can be changed into another prime (320226121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160128060 + 160128061.

It is an arithmetic number, because the mean of its divisors is an integer number (160128061).

Almost surely, 2^320256121 is an apocalyptic number.

It is an amenable number.

320256121 is a deficient number, since it is larger than the sum of its proper divisors (1).

320256121 is an equidigital number, since it uses as much as digits as its factorization.

320256121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 320256121 is about 17895.7011877154. The cubic root of 320256121 is about 684.1728136526.

The spelling of 320256121 in words is "three hundred twenty million, two hundred fifty-six thousand, one hundred twenty-one".