318561161 has 2 divisors, whose sum is σ = 318561162. Its totient is φ = 318561160.

The previous prime is 318561097. The next prime is 318561179. The reversal of 318561161 is 161165813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258405625 + 60155536 = 16075^2 + 7756^2 .

It is a cyclic number.

It is not a de Polignac number, because 318561161 - 2⁶ = 318561097 is a prime.

It is not a weakly prime, because it can be changed into another prime (318561461) 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, 159280580 + 159280581.

It is an arithmetic number, because the mean of its divisors is an integer number (159280581).

Almost surely, 2^318561161 is an apocalyptic number.

It is an amenable number.

318561161 is a deficient number, since it is larger than the sum of its proper divisors (1).

318561161 is an equidigital number, since it uses as much as digits as its factorization.

318561161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 318561161 is about 17848.2817380273. The cubic root of 318561161 is about 682.9636799561.

It can be divided in two parts, 3185 and 61161, that added together give a palindrome (64346).

The spelling of 318561161 in words is "three hundred eighteen million, five hundred sixty-one thousand, one hundred sixty-one".