1023563 has 4 divisors (see below), whose sum is σ = 1026720. Its totient is φ = 1020408.

The previous prime is 1023557. The next prime is 1023571. The reversal of 1023563 is 3653201.

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

It is a cyclic number.

It is not a de Polignac number, because 1023563 - 2⁶ = 1023499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028 + ... + 1761.

It is an arithmetic number, because the mean of its divisors is an integer number (256680).

2^1023563 is an apocalyptic number.

1023563 is a deficient number, since it is larger than the sum of its proper divisors (3157).

1023563 is an equidigital number, since it uses as much as digits as its factorization.

1023563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1023563 is about 1011.7129039406. The cubic root of 1023563 is about 100.7793437874.

Adding to 1023563 its reverse (3653201), we get a palindrome (4676764).

The spelling of 1023563 in words is "one million, twenty-three thousand, five hundred sixty-three".