1001563 has 2 divisors, whose sum is σ = 1001564. Its totient is φ = 1001562.

The previous prime is 1001551. The next prime is 1001569. The reversal of 1001563 is 3651001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001563 - 2⁵ = 1001531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001569) 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 as a sum of consecutive naturals, namely, 500781 + 500782.

It is an arithmetic number, because the mean of its divisors is an integer number (500782).

2^1001563 is an apocalyptic number.

1001563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001563 is an equidigital number, since it uses as much as digits as its factorization.

1001563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 1001563 is about 1000.7811948673. The cubic root of 1001563 is about 100.0520728794.

Adding to 1001563 its reverse (3651001), we get a palindrome (4652564).

The spelling of 1001563 in words is "one million, one thousand, five hundred sixty-three".