318689249 has 2 divisors, whose sum is σ = 318689250. Its totient is φ = 318689248.

The previous prime is 318689237. The next prime is 318689257. The reversal of 318689249 is 942986813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261792400 + 56896849 = 16180^2 + 7543^2 .

It is an emirp because it is prime and its reverse (942986813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318689249 - 2⁴ = 318689233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 318689197 and 318689206.

It is not a weakly prime, because it can be changed into another prime (318689209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159344624 + 159344625.

It is an arithmetic number, because the mean of its divisors is an integer number (159344625).

Almost surely, 2^318689249 is an apocalyptic number.

It is an amenable number.

318689249 is a deficient number, since it is larger than the sum of its proper divisors (1).

318689249 is an equidigital number, since it uses as much as digits as its factorization.

318689249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The square root of 318689249 is about 17851.8696219752. The cubic root of 318689249 is about 683.0552036994.

The spelling of 318689249 in words is "three hundred eighteen million, six hundred eighty-nine thousand, two hundred forty-nine".