861415847 has 2 divisors, whose sum is σ = 861415848. Its totient is φ = 861415846.

The previous prime is 861415843. The next prime is 861415873. The reversal of 861415847 is 748514168.

861415847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861415847 - 2² = 861415843 is a prime.

It is a super-2 number, since 2×861415847² = 1484074522925454818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861415798 and 861415807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861415843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430707923 + 430707924.

It is an arithmetic number, because the mean of its divisors is an integer number (430707924).

Almost surely, 2^861415847 is an apocalyptic number.

861415847 is a deficient number, since it is larger than the sum of its proper divisors (1).

861415847 is an equidigital number, since it uses as much as digits as its factorization.

861415847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 44.

The square root of 861415847 is about 29349.8866607692. The cubic root of 861415847 is about 951.4901257022.

The spelling of 861415847 in words is "eight hundred sixty-one million, four hundred fifteen thousand, eight hundred forty-seven".