861084863 has 4 divisors (see below), whose sum is σ = 861220248. Its totient is φ = 860949480.

The previous prime is 861084853. The next prime is 861084929. The reversal of 861084863 is 368480168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861084863 - 2⁸ = 861084607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861084853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57656 + ... + 71037.

It is an arithmetic number, because the mean of its divisors is an integer number (215305062).

Almost surely, 2^861084863 is an apocalyptic number.

861084863 is a deficient number, since it is larger than the sum of its proper divisors (135385).

861084863 is a wasteful number, since it uses less digits than its factorization.

861084863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135384.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 861084863 is about 29344.2475282635. The cubic root of 861084863 is about 951.3682456010.

The spelling of 861084863 in words is "eight hundred sixty-one million, eighty-four thousand, eight hundred sixty-three".