320203001161 has 2 divisors, whose sum is σ = 320203001162. Its totient is φ = 320203001160.

The previous prime is 320203001159. The next prime is 320203001221. The reversal of 320203001161 is 161100302023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219193448761 + 101009552400 = 468181^2 + 317820^2 .

It is a cyclic number.

It is not a de Polignac number, because 320203001161 - 2¹ = 320203001159 is a prime.

It is a super-2 number, since 2×320203001161² (a number of 24 digits) contains 22 as substring.

Together with 320203001159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (320203001561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160101500580 + 160101500581.

It is an arithmetic number, because the mean of its divisors is an integer number (160101500581).

Almost surely, 2^320203001161 is an apocalyptic number.

It is an amenable number.

320203001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

320203001161 is an equidigital number, since it uses as much as digits as its factorization.

320203001161 is an odious number, because the sum of its binary digits is odd.

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

Adding to 320203001161 its reverse (161100302023), we get a palindrome (481303303184).

The spelling of 320203001161 in words is "three hundred twenty billion, two hundred three million, one thousand, one hundred sixty-one".