918563 has 2 divisors, whose sum is σ = 918564. Its totient is φ = 918562.

The previous prime is 918539. The next prime is 918581. The reversal of 918563 is 365819.

918563 is nontrivially palindromic in base 8.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 918563 - 2¹² = 914467 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (918583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459281 + 459282.

It is an arithmetic number, because the mean of its divisors is an integer number (459282).

2⁹¹⁸⁵⁶³ is an apocalyptic number.

918563 is a deficient number, since it is larger than the sum of its proper divisors (1).

918563 is an equidigital number, since it uses as much as digits as its factorization.

918563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 918563 is about 958.4169238906. The cubic root of 918563 is about 97.2082181855.

The spelling of 918563 in words is "nine hundred eighteen thousand, five hundred sixty-three".