25581241 has 4 divisors (see below), whose sum is σ = 29235712. Its totient is φ = 21926772.

The previous prime is 25581217. The next prime is 25581247. The reversal of 25581241 is 14218552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25581241 - 2⁹ = 25580729 is a prime.

It is a super-2 number, since 2×25581241² = 1308799782200162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25581247) 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, 1827225 + ... + 1827238.

It is an arithmetic number, because the mean of its divisors is an integer number (7308928).

Almost surely, 2^25581241 is an apocalyptic number.

It is an amenable number.

25581241 is a deficient number, since it is larger than the sum of its proper divisors (3654471).

25581241 is an equidigital number, since it uses as much as digits as its factorization.

25581241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654470.

The product of its digits is 3200, while the sum is 28.

The square root of 25581241 is about 5057.7901300865. The cubic root of 25581241 is about 294.6505140224.

Adding to 25581241 its reverse (14218552), we get a palindrome (39799793).

The spelling of 25581241 in words is "twenty-five million, five hundred eighty-one thousand, two hundred forty-one".