318221489 has 2 divisors, whose sum is σ = 318221490. Its totient is φ = 318221488.

The previous prime is 318221429. The next prime is 318221507. The reversal of 318221489 is 984122813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297217600 + 21003889 = 17240^2 + 4583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318221489 is a prime.

It is a super-2 number, since 2×318221489² = 202529832122754242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (318221429) 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, 159110744 + 159110745.

It is an arithmetic number, because the mean of its divisors is an integer number (159110745).

Almost surely, 2^318221489 is an apocalyptic number.

It is an amenable number.

318221489 is a deficient number, since it is larger than the sum of its proper divisors (1).

318221489 is an equidigital number, since it uses as much as digits as its factorization.

318221489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 318221489 is about 17838.7636623170. The cubic root of 318221489 is about 682.7208525509.

The spelling of 318221489 in words is "three hundred eighteen million, two hundred twenty-one thousand, four hundred eighty-nine".