2581239 has 4 divisors (see below), whose sum is σ = 3441656. Its totient is φ = 1720824.

The previous prime is 2581223. The next prime is 2581253. The reversal of 2581239 is 9321852.

It is a happy number.

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

It is not a de Polignac number, because 2581239 - 2⁴ = 2581223 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581219) 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, 430204 + ... + 430209.

It is an arithmetic number, because the mean of its divisors is an integer number (860414).

2^2581239 is an apocalyptic number.

2581239 is a deficient number, since it is larger than the sum of its proper divisors (860417).

2581239 is an equidigital number, since it uses as much as digits as its factorization.

2581239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860416.

The product of its digits is 4320, while the sum is 30.

The square root of 2581239 is about 1606.6234779811. The cubic root of 2581239 is about 137.1753486694.

The spelling of 2581239 in words is "two million, five hundred eighty-one thousand, two hundred thirty-nine".