2581543 has 4 divisors (see below), whose sum is σ = 2693808. Its totient is φ = 2469280.

The previous prime is 2581541. The next prime is 2581559. The reversal of 2581543 is 3451852.

2581543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2581543 - 2¹ = 2581541 is a prime.

It is a Duffinian number.

2581543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56098 + ... + 56143.

It is an arithmetic number, because the mean of its divisors is an integer number (673452).

2^2581543 is an apocalyptic number.

2581543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2581543 is a deficient number, since it is larger than the sum of its proper divisors (112265).

2581543 is a wasteful number, since it uses less digits than its factorization.

2581543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112264.

The product of its digits is 4800, while the sum is 28.

The square root of 2581543 is about 1606.7180835480. The cubic root of 2581543 is about 137.1807336375.

The spelling of 2581543 in words is "two million, five hundred eighty-one thousand, five hundred forty-three".