2543543 has 4 divisors (see below), whose sum is σ = 2550288. Its totient is φ = 2536800.

The previous prime is 2543537. The next prime is 2543551. The reversal of 2543543 is 3453452.

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 2543543 - 2⁶ = 2543479 is a prime.

It is a super-2 number, since 2×2543543² = 12939221985698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543573) 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, 2771 + ... + 3572.

It is an arithmetic number, because the mean of its divisors is an integer number (637572).

2^2543543 is an apocalyptic number.

2543543 is a deficient number, since it is larger than the sum of its proper divisors (6745).

2543543 is an equidigital number, since it uses as much as digits as its factorization.

2543543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744.

The product of its digits is 7200, while the sum is 26.

The square root of 2543543 is about 1594.8488956638. The cubic root of 2543543 is about 136.5043091485.

Adding to 2543543 its reverse (3453452), we get a palindrome (5996995).

Subtracting 2543543 from its reverse (3453452), we obtain a palindrome (909909).

The spelling of 2543543 in words is "two million, five hundred forty-three thousand, five hundred forty-three".