861082865 has 8 divisors (see below), whose sum is σ = 1033790568. Its totient is φ = 688538880.

The previous prime is 861082843. The next prime is 861082889. The reversal of 861082865 is 568280168.

861082865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 385101376 + 475981489 = 19624^2 + 21817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 861082865 - 2⁸ = 861082609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29042 + ... + 50651.

It is an arithmetic number, because the mean of its divisors is an integer number (129223821).

Almost surely, 2^861082865 is an apocalyptic number.

It is an amenable number.

861082865 is a deficient number, since it is larger than the sum of its proper divisors (172707703).

861082865 is a wasteful number, since it uses less digits than its factorization.

861082865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81859.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 861082865 is about 29344.2134840926. The cubic root of 861082865 is about 951.3675097714.

The spelling of 861082865 in words is "eight hundred sixty-one million, eighty-two thousand, eight hundred sixty-five".