999563 has 2 divisors, whose sum is σ = 999564. Its totient is φ = 999562.

The previous prime is 999553. The next prime is 999599. The reversal of 999563 is 365999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999563 - 2⁶ = 999499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999563.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999563.

It is not a weakly prime, because it can be changed into another prime (999553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499781 + 499782.

It is an arithmetic number, because the mean of its divisors is an integer number (499782).

2⁹⁹⁹⁵⁶³ is an apocalyptic number.

999563 is a deficient number, since it is larger than the sum of its proper divisors (1).

999563 is an equidigital number, since it uses as much as digits as its factorization.

999563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65610, while the sum is 41.

The square root of 999563 is about 999.7814761237. The cubic root of 999563 is about 99.9854312109.

The spelling of 999563 in words is "nine hundred ninety-nine thousand, five hundred sixty-three".