318944261 has 2 divisors, whose sum is σ = 318944262. Its totient is φ = 318944260.

The previous prime is 318944239. The next prime is 318944267. The reversal of 318944261 is 162449813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317053636 + 1890625 = 17806^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 318944261 - 2¹⁰ = 318943237 is a prime.

It is a super-2 number, since 2×318944261² = 203450883249672242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318944267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159472130 + 159472131.

It is an arithmetic number, because the mean of its divisors is an integer number (159472131).

Almost surely, 2^318944261 is an apocalyptic number.

It is an amenable number.

318944261 is a deficient number, since it is larger than the sum of its proper divisors (1).

318944261 is an equidigital number, since it uses as much as digits as its factorization.

318944261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 318944261 is about 17859.0106388904. The cubic root of 318944261 is about 683.2373464752.

The spelling of 318944261 in words is "three hundred eighteen million, nine hundred forty-four thousand, two hundred sixty-one".