8217861139 has 2 divisors, whose sum is σ = 8217861140. Its totient is φ = 8217861138.

The previous prime is 8217861103. The next prime is 8217861203. The reversal of 8217861139 is 9311687128.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8217861139 - 2¹⁵ = 8217828371 is a prime.

It is not a weakly prime, because it can be changed into another prime (8217861439) 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, 4108930569 + 4108930570.

It is an arithmetic number, because the mean of its divisors is an integer number (4108930570).

Almost surely, 2^8217861139 is an apocalyptic number.

8217861139 is a deficient number, since it is larger than the sum of its proper divisors (1).

8217861139 is an equidigital number, since it uses as much as digits as its factorization.

8217861139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 8217861139 is about 90652.4193775323. The cubic root of 8217861139 is about 2017.9927401553.

The spelling of 8217861139 in words is "eight billion, two hundred seventeen million, eight hundred sixty-one thousand, one hundred thirty-nine".