2509543 has 4 divisors (see below), whose sum is σ = 2590528. Its totient is φ = 2428560.

The previous prime is 2509541. The next prime is 2509561. The reversal of 2509543 is 3459052.

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 2509543 - 2¹ = 2509541 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 (2509541) 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, 40446 + ... + 40507.

It is an arithmetic number, because the mean of its divisors is an integer number (647632).

2^2509543 is an apocalyptic number.

2509543 is a deficient number, since it is larger than the sum of its proper divisors (80985).

2509543 is an equidigital number, since it uses as much as digits as its factorization.

2509543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80984.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 2509543 is about 1584.1537172888. The cubic root of 2509543 is about 135.8933528110.

It can be divided in two parts, 2 and 509543, that added together give a triangular number (509545 = T₁₀₀₉).

The spelling of 2509543 in words is "two million, five hundred nine thousand, five hundred forty-three".