1321543 has 4 divisors (see below), whose sum is σ = 1326528. Its totient is φ = 1316560.

The previous prime is 1321517. The next prime is 1321549. The reversal of 1321543 is 3451231.

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 1321543 - 2⁹ = 1321031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071 + ... + 2632.

It is an arithmetic number, because the mean of its divisors is an integer number (331632).

2^1321543 is an apocalyptic number.

1321543 is a deficient number, since it is larger than the sum of its proper divisors (4985).

1321543 is an equidigital number, since it uses as much as digits as its factorization.

1321543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4984.

The product of its digits is 360, while the sum is 19.

The square root of 1321543 is about 1149.5838377430. The cubic root of 1321543 is about 109.7388571146.

Adding to 1321543 its reverse (3451231), we get a palindrome (4772774).

The spelling of 1321543 in words is "one million, three hundred twenty-one thousand, five hundred forty-three".