863868851 has 4 divisors (see below), whose sum is σ = 864657432. Its totient is φ = 863080272.

The previous prime is 863868829. The next prime is 863868899. The reversal of 863868851 is 158868368.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863868851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863868793 and 863868802.

It is not an unprimeable number, because it can be changed into a prime (863268851) 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, 392645 + ... + 394838.

It is an arithmetic number, because the mean of its divisors is an integer number (216164358).

Almost surely, 2^863868851 is an apocalyptic number.

863868851 is a deficient number, since it is larger than the sum of its proper divisors (788581).

863868851 is a wasteful number, since it uses less digits than its factorization.

863868851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788580.

The product of its digits is 2211840, while the sum is 53.

The square root of 863868851 is about 29391.6459389399. The cubic root of 863868851 is about 952.3924375246.

The spelling of 863868851 in words is "eight hundred sixty-three million, eight hundred sixty-eight thousand, eight hundred fifty-one".