1321563 has 8 divisors (see below), whose sum is σ = 1865808. Its totient is φ = 829184.

The previous prime is 1321549. The next prime is 1321571. The reversal of 1321563 is 3651231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321563 - 2¹³ = 1313371 is a prime.

1321563 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1321513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12906 + ... + 13007.

It is an arithmetic number, because the mean of its divisors is an integer number (233226).

2^1321563 is an apocalyptic number.

1321563 is a deficient number, since it is larger than the sum of its proper divisors (544245).

1321563 is a wasteful number, since it uses less digits than its factorization.

1321563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25933.

The product of its digits is 540, while the sum is 21.

The square root of 1321563 is about 1149.5925365102. The cubic root of 1321563 is about 109.7394107013.

Adding to 1321563 its reverse (3651231), we get a palindrome (4972794).

The spelling of 1321563 in words is "one million, three hundred twenty-one thousand, five hundred sixty-three".