563391 has 12 divisors (see below), whose sum is σ = 828360. Its totient is φ = 368880.

The previous prime is 563377. The next prime is 563401. The reversal of 563391 is 193365.

563391 is a nontrivial binomial coefficient, being equal to C(1062, 2).

It is not a de Polignac number, because 563391 - 2⁵ = 563359 is a prime.

563391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563351) 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 11 ways as a sum of consecutive naturals, for example, 1 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (69030).

2⁵⁶³³⁹¹ is an apocalyptic number.

563391 is the 1061-st triangular number and also the 531-st hexagonal number.

563391 is a deficient number, since it is larger than the sum of its proper divisors (264969).

563391 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (563390) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1123).

563391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1123 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 563391 is about 750.5937649621. The cubic root of 563391 is about 82.5917436692.

The spelling of 563391 in words is "five hundred sixty-three thousand, three hundred ninety-one".