861384847 has 2 divisors, whose sum is σ = 861384848. Its totient is φ = 861384846.

The previous prime is 861384841. The next prime is 861384859. The reversal of 861384847 is 748483168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861384847 - 2¹¹ = 861382799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861384847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861384841) 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, 430692423 + 430692424.

It is an arithmetic number, because the mean of its divisors is an integer number (430692424).

Almost surely, 2^861384847 is an apocalyptic number.

861384847 is a deficient number, since it is larger than the sum of its proper divisors (1).

861384847 is an equidigital number, since it uses as much as digits as its factorization.

861384847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1032192, while the sum is 49.

The square root of 861384847 is about 29349.3585449495. The cubic root of 861384847 is about 951.4787117229.

The spelling of 861384847 in words is "eight hundred sixty-one million, three hundred eighty-four thousand, eight hundred forty-seven".