320440121 has 2 divisors, whose sum is σ = 320440122. Its totient is φ = 320440120.

The previous prime is 320440103. The next prime is 320440129. The reversal of 320440121 is 121044023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305725225 + 14714896 = 17485^2 + 3836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320440121 is a prime.

It is a super-2 number, since 2×320440121² = 205363742292989282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320440121.

It is not a weakly prime, because it can be changed into another prime (320440129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160220060 + 160220061.

It is an arithmetic number, because the mean of its divisors is an integer number (160220061).

Almost surely, 2^320440121 is an apocalyptic number.

It is an amenable number.

320440121 is a deficient number, since it is larger than the sum of its proper divisors (1).

320440121 is an equidigital number, since it uses as much as digits as its factorization.

320440121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 320440121 is about 17900.8413489422. The cubic root of 320440121 is about 684.3038168174.

Adding to 320440121 its reverse (121044023), we get a palindrome (441484144).

The spelling of 320440121 in words is "three hundred twenty million, four hundred forty thousand, one hundred twenty-one".