2542543 has 4 divisors (see below), whose sum is σ = 2546440. Its totient is φ = 2538648.

The previous prime is 2542531. The next prime is 2542549. The reversal of 2542543 is 3452452.

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 2542543 - 2⁵ = 2542511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2542549) 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, 705 + ... + 2362.

It is an arithmetic number, because the mean of its divisors is an integer number (636610).

2^2542543 is an apocalyptic number.

2542543 is a deficient number, since it is larger than the sum of its proper divisors (3897).

2542543 is an equidigital number, since it uses as much as digits as its factorization.

2542543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896.

The product of its digits is 4800, while the sum is 25.

The square root of 2542543 is about 1594.5353555190. The cubic root of 2542543 is about 136.4864178053.

Adding to 2542543 its reverse (3452452), we get a palindrome (5994995).

Subtracting 2542543 from its reverse (3452452), we obtain a palindrome (909909).

The spelling of 2542543 in words is "two million, five hundred forty-two thousand, five hundred forty-three".