867816217 has 2 divisors, whose sum is σ = 867816218. Its totient is φ = 867816216.

The previous prime is 867816163. The next prime is 867816277. The reversal of 867816217 is 712618768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623800576 + 244015641 = 24976^2 + 15621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-867816217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (867816277) 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, 433908108 + 433908109.

It is an arithmetic number, because the mean of its divisors is an integer number (433908109).

Almost surely, 2^867816217 is an apocalyptic number.

It is an amenable number.

867816217 is a deficient number, since it is larger than the sum of its proper divisors (1).

867816217 is an equidigital number, since it uses as much as digits as its factorization.

867816217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 867816217 is about 29458.7205594540. The cubic root of 867816217 is about 953.8408556412.

The spelling of 867816217 in words is "eight hundred sixty-seven million, eight hundred sixteen thousand, two hundred seventeen".