318225121 has 2 divisors, whose sum is σ = 318225122. Its totient is φ = 318225120.

The previous prime is 318225119. The next prime is 318225133. The reversal of 318225121 is 121522813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292581025 + 25644096 = 17105^2 + 5064^2 .

It is a cyclic number.

It is not a de Polignac number, because 318225121 - 2¹ = 318225119 is a prime.

Together with 318225119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (318225181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159112560 + 159112561.

It is an arithmetic number, because the mean of its divisors is an integer number (159112561).

Almost surely, 2^318225121 is an apocalyptic number.

It is an amenable number.

318225121 is a deficient number, since it is larger than the sum of its proper divisors (1).

318225121 is an equidigital number, since it uses as much as digits as its factorization.

318225121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 318225121 is about 17838.8654628034. The cubic root of 318225121 is about 682.7234499376.

Adding to 318225121 its reverse (121522813), we get a palindrome (439747934).

The spelling of 318225121 in words is "three hundred eighteen million, two hundred twenty-five thousand, one hundred twenty-one".