863563 has 4 divisors (see below), whose sum is σ = 876520. Its totient is φ = 850608.

The previous prime is 863561. The next prime is 863593. The reversal of 863563 is 365368.

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 863563 - 2¹ = 863561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6378 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (219130).

2⁸⁶³⁵⁶³ is an apocalyptic number.

863563 is a deficient number, since it is larger than the sum of its proper divisors (12957).

863563 is a wasteful number, since it uses less digits than its factorization.

863563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12956.

The product of its digits is 12960, while the sum is 31.

The square root of 863563 is about 929.2809047861. The cubic root of 863563 is about 95.2280026726.

The spelling of 863563 in words is "eight hundred sixty-three thousand, five hundred sixty-three".