863289891 has 48 divisors (see below), whose sum is σ = 1329549312. Its totient is φ = 538876800.

The previous prime is 863289881. The next prime is 863289913. The reversal of 863289891 is 198982368.

It is a happy number.

It is not a de Polignac number, because 863289891 - 2⁹ = 863289379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (863289821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1864326 + ... + 1864788.

It is an arithmetic number, because the mean of its divisors is an integer number (27698944).

Almost surely, 2^863289891 is an apocalyptic number.

863289891 is a deficient number, since it is larger than the sum of its proper divisors (466259421).

863289891 is a wasteful number, since it uses less digits than its factorization.

863289891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 701 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 863289891 is about 29381.7952310610. The cubic root of 863289891 is about 952.1796273078.

The spelling of 863289891 in words is "eight hundred sixty-three million, two hundred eighty-nine thousand, eight hundred ninety-one".