25481591 has 4 divisors (see below), whose sum is σ = 25899384. Its totient is φ = 25063800.

The previous prime is 25481587. The next prime is 25481611. The reversal of 25481591 is 19518452.

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 25481591 - 2² = 25481587 is a prime.

It is a super-2 number, since 2×25481591² = 1298622959782562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25481531) 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, 208805 + ... + 208926.

It is an arithmetic number, because the mean of its divisors is an integer number (6474846).

Almost surely, 2^25481591 is an apocalyptic number.

25481591 is a deficient number, since it is larger than the sum of its proper divisors (417793).

25481591 is an equidigital number, since it uses as much as digits as its factorization.

25481591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417792.

The product of its digits is 14400, while the sum is 35.

The square root of 25481591 is about 5047.9293774775. The cubic root of 25481591 is about 294.2674190786.

The spelling of 25481591 in words is "twenty-five million, four hundred eighty-one thousand, five hundred ninety-one".