863878031 has 4 divisors (see below), whose sum is σ = 864029712. Its totient is φ = 863726352.

The previous prime is 863878007. The next prime is 863878033. The reversal of 863878031 is 130878368.

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-863878031 is a prime.

It is a super-3 number, since 3×863878031³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863878033) 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, 66950 + ... + 78803.

It is an arithmetic number, because the mean of its divisors is an integer number (216007428).

Almost surely, 2^863878031 is an apocalyptic number.

863878031 is a deficient number, since it is larger than the sum of its proper divisors (151681).

863878031 is a wasteful number, since it uses less digits than its factorization.

863878031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151680.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 863878031 is about 29391.8021053490. The cubic root of 863878031 is about 952.3958110813.

The spelling of 863878031 in words is "eight hundred sixty-three million, eight hundred seventy-eight thousand, thirty-one".