867318721 has 2 divisors, whose sum is σ = 867318722. Its totient is φ = 867318720.

The previous prime is 867318671. The next prime is 867318743. The reversal of 867318721 is 127813768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776402496 + 90916225 = 27864^2 + 9535^2 .

It is a cyclic number.

It is not a de Polignac number, because 867318721 - 2²⁹ = 330447809 is a prime.

It is not a weakly prime, because it can be changed into another prime (867310721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433659360 + 433659361.

It is an arithmetic number, because the mean of its divisors is an integer number (433659361).

Almost surely, 2^867318721 is an apocalyptic number.

It is an amenable number.

867318721 is a deficient number, since it is larger than the sum of its proper divisors (1).

867318721 is an equidigital number, since it uses as much as digits as its factorization.

867318721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 43.

The square root of 867318721 is about 29450.2753976937. The cubic root of 867318721 is about 953.6585502526.

The spelling of 867318721 in words is "eight hundred sixty-seven million, three hundred eighteen thousand, seven hundred twenty-one".