393318161 has 2 divisors, whose sum is σ = 393318162. Its totient is φ = 393318160.

The previous prime is 393318157. The next prime is 393318187. The reversal of 393318161 is 161813393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378069136 + 15249025 = 19444^2 + 3905^2 .

It is a cyclic number.

It is not a de Polignac number, because 393318161 - 2² = 393318157 is a prime.

It is not a weakly prime, because it can be changed into another prime (393318151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196659080 + 196659081.

It is an arithmetic number, because the mean of its divisors is an integer number (196659081).

Almost surely, 2^393318161 is an apocalyptic number.

It is an amenable number.

393318161 is a deficient number, since it is larger than the sum of its proper divisors (1).

393318161 is an equidigital number, since it uses as much as digits as its factorization.

393318161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 393318161 is about 19832.2505278650. The cubic root of 393318161 is about 732.6805565457.

The spelling of 393318161 in words is "three hundred ninety-three million, three hundred eighteen thousand, one hundred sixty-one".