318732889 has 2 divisors, whose sum is σ = 318732890. Its totient is φ = 318732888.

The previous prime is 318732857. The next prime is 318732907. The reversal of 318732889 is 988237813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313290000 + 5442889 = 17700^2 + 2333^2 .

It is an emirp because it is prime and its reverse (988237813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318732889 - 2⁵ = 318732857 is a prime.

It is not a weakly prime, because it can be changed into another prime (318732839) 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, 159366444 + 159366445.

It is an arithmetic number, because the mean of its divisors is an integer number (159366445).

Almost surely, 2^318732889 is an apocalyptic number.

It is an amenable number.

318732889 is a deficient number, since it is larger than the sum of its proper divisors (1).

318732889 is an equidigital number, since it uses as much as digits as its factorization.

318732889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 318732889 is about 17853.0918610755. The cubic root of 318732889 is about 683.0863805367.

The spelling of 318732889 in words is "three hundred eighteen million, seven hundred thirty-two thousand, eight hundred eighty-nine".