320313232181 has 2 divisors, whose sum is σ = 320313232182. Its totient is φ = 320313232180.

The previous prime is 320313232153. The next prime is 320313232207. The reversal of 320313232181 is 181232313023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306961429681 + 13351802500 = 554041^2 + 115550^2 .

It is a cyclic number.

It is not a de Polignac number, because 320313232181 - 2³⁴ = 303133362997 is a prime.

It is a super-2 number, since 2×320313232181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320313232081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160156616090 + 160156616091.

It is an arithmetic number, because the mean of its divisors is an integer number (160156616091).

Almost surely, 2^320313232181 is an apocalyptic number.

It is an amenable number.

320313232181 is a deficient number, since it is larger than the sum of its proper divisors (1).

320313232181 is an equidigital number, since it uses as much as digits as its factorization.

320313232181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 320313232181 in words is "three hundred twenty billion, three hundred thirteen million, two hundred thirty-two thousand, one hundred eighty-one".