563691 has 4 divisors (see below), whose sum is σ = 751592. Its totient is φ = 375792.

The previous prime is 563663. The next prime is 563723. The reversal of 563691 is 196365.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-563691 is a prime.

It is a D-number.

It is a Duffinian number.

563691 is a lucky number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (562691) 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, 93946 + ... + 93951.

It is an arithmetic number, because the mean of its divisors is an integer number (187898).

2⁵⁶³⁶⁹¹ is an apocalyptic number.

563691 is a deficient number, since it is larger than the sum of its proper divisors (187901).

563691 is a wasteful number, since it uses less digits than its factorization.

563691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187900.

The product of its digits is 4860, while the sum is 30.

The square root of 563691 is about 750.7935801537. The cubic root of 563691 is about 82.6064008235.

The spelling of 563691 in words is "five hundred sixty-three thousand, six hundred ninety-one".