318541961 has 2 divisors, whose sum is σ = 318541962. Its totient is φ = 318541960.

The previous prime is 318541943. The next prime is 318541963. The reversal of 318541961 is 169145813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274399225 + 44142736 = 16565^2 + 6644^2 .

It is an emirp because it is prime and its reverse (169145813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318541961 is a prime.

Together with 318541963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318541963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159270980 + 159270981.

It is an arithmetic number, because the mean of its divisors is an integer number (159270981).

Almost surely, 2^318541961 is an apocalyptic number.

It is an amenable number.

318541961 is a deficient number, since it is larger than the sum of its proper divisors (1).

318541961 is an equidigital number, since it uses as much as digits as its factorization.

318541961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 318541961 is about 17847.7438630209. The cubic root of 318541961 is about 682.9499587123.

The spelling of 318541961 in words is "three hundred eighteen million, five hundred forty-one thousand, nine hundred sixty-one".