25581525 has 12 divisors (see below), whose sum is σ = 42294912. Its totient is φ = 13643440.

The previous prime is 25581503. The next prime is 25581527. The reversal of 25581525 is 52518552.

It is not a de Polignac number, because 25581525 - 2⁶ = 25581461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25581527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170469 + ... + 170618.

It is an arithmetic number, because the mean of its divisors is an integer number (3524576).

Almost surely, 2^25581525 is an apocalyptic number.

25581525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25581525 is a deficient number, since it is larger than the sum of its proper divisors (16713387).

25581525 is a wasteful number, since it uses less digits than its factorization.

25581525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341100 (or 341095 counting only the distinct ones).

The product of its digits is 20000, while the sum is 33.

The square root of 25581525 is about 5057.8182055111. The cubic root of 25581525 is about 294.6516044104.

It can be divided in two parts, 25581 and 525, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 25581525 in words is "twenty-five million, five hundred eighty-one thousand, five hundred twenty-five".