320123161 has 2 divisors, whose sum is σ = 320123162. Its totient is φ = 320123160.

The previous prime is 320123159. The next prime is 320123189. The reversal of 320123161 is 161321023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207360000 + 112763161 = 14400^2 + 10619^2 .

It is a cyclic number.

It is not a de Polignac number, because 320123161 - 2¹ = 320123159 is a prime.

Together with 320123159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (320123101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160061580 + 160061581.

It is an arithmetic number, because the mean of its divisors is an integer number (160061581).

Almost surely, 2^320123161 is an apocalyptic number.

It is an amenable number.

320123161 is a deficient number, since it is larger than the sum of its proper divisors (1).

320123161 is an equidigital number, since it uses as much as digits as its factorization.

320123161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 320123161 is about 17891.9859434329. The cubic root of 320123161 is about 684.0781183934.

Adding to 320123161 its reverse (161321023), we get a palindrome (481444184).

It can be divided in two parts, 3201 and 23161, that added together give a palindrome (26362).

The spelling of 320123161 in words is "three hundred twenty million, one hundred twenty-three thousand, one hundred sixty-one".