2521543 has 4 divisors (see below), whose sum is σ = 2546128. Its totient is φ = 2496960.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521543 is 3451252.

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 2521543 - 2⁹ = 2521031 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 (2521643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12138 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (636532).

2^2521543 is an apocalyptic number.

2521543 is a deficient number, since it is larger than the sum of its proper divisors (24585).

2521543 is a wasteful number, since it uses less digits than its factorization.

2521543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24584.

The product of its digits is 1200, while the sum is 22.

The square root of 2521543 is about 1587.9367115852. The cubic root of 2521543 is about 136.1096110282.

Adding to 2521543 its reverse (3451252), we get a palindrome (5972795).

The spelling of 2521543 in words is "two million, five hundred twenty-one thousand, five hundred forty-three".