1213543 has 4 divisors (see below), whose sum is σ = 1228248. Its totient is φ = 1198840.

The previous prime is 1213529. The next prime is 1213547. The reversal of 1213543 is 3453121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213543 is a prime.

It is a super-2 number, since 2×1213543² = 2945373225698, which contains 22 as substring.

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 1213543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213547) 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, 7228 + ... + 7393.

It is an arithmetic number, because the mean of its divisors is an integer number (307062).

2^1213543 is an apocalyptic number.

1213543 is a deficient number, since it is larger than the sum of its proper divisors (14705).

1213543 is an equidigital number, since it uses as much as digits as its factorization.

1213543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14704.

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

The square root of 1213543 is about 1101.6092773756. The cubic root of 1213543 is about 106.6641286288.

Adding to 1213543 its reverse (3453121), we get a palindrome (4666664).

The spelling of 1213543 in words is "one million, two hundred thirteen thousand, five hundred forty-three".