8215846861 has 2 divisors, whose sum is σ = 8215846862. Its totient is φ = 8215846860.

The previous prime is 8215846841. The next prime is 8215846879. The reversal of 8215846861 is 1686485128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6036357636 + 2179489225 = 77694^2 + 46685^2 .

It is a cyclic number.

It is not a de Polignac number, because 8215846861 - 2⁹ = 8215846349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8215846841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4107923430 + 4107923431.

It is an arithmetic number, because the mean of its divisors is an integer number (4107923431).

Almost surely, 2^8215846861 is an apocalyptic number.

It is an amenable number.

8215846861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215846861 is an equidigital number, since it uses as much as digits as its factorization.

8215846861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 49.

The square root of 8215846861 is about 90641.3088001271. The cubic root of 8215846861 is about 2017.8278501081.

The spelling of 8215846861 in words is "eight billion, two hundred fifteen million, eight hundred forty-six thousand, eight hundred sixty-one".