318311729 has 2 divisors, whose sum is σ = 318311730. Its totient is φ = 318311728.

The previous prime is 318311717. The next prime is 318311753. The reversal of 318311729 is 927113813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306250000 + 12061729 = 17500^2 + 3473^2 .

It is an emirp because it is prime and its reverse (927113813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318311729 - 2²⁰ = 317263153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318316729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159155864 + 159155865.

It is an arithmetic number, because the mean of its divisors is an integer number (159155865).

Almost surely, 2^318311729 is an apocalyptic number.

It is an amenable number.

318311729 is a deficient number, since it is larger than the sum of its proper divisors (1).

318311729 is an equidigital number, since it uses as much as digits as its factorization.

318311729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 318311729 is about 17841.2928062963. The cubic root of 318311729 is about 682.7853808844.

The spelling of 318311729 in words is "three hundred eighteen million, three hundred eleven thousand, seven hundred twenty-nine".