25209525 has 24 divisors (see below), whose sum is σ = 45470304. Its totient is φ = 12222400.

The previous prime is 25209421. The next prime is 25209529. The reversal of 25209525 is 52590252.

It is not a de Polignac number, because 25209525 - 2⁸ = 25209269 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25209492 and 25209501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25209529) 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 23 ways as a sum of consecutive naturals, for example, 14454 + ... + 16103.

It is an arithmetic number, because the mean of its divisors is an integer number (1894596).

Almost surely, 2^25209525 is an apocalyptic number.

25209525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25209525 is a deficient number, since it is larger than the sum of its proper divisors (20260779).

25209525 is a wasteful number, since it uses less digits than its factorization.

25209525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30581 (or 30576 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25209525 is about 5020.9087822823. The cubic root of 25209525 is about 293.2163754055.

Adding to 25209525 its reverse (52590252), we get a palindrome (77799777).

The spelling of 25209525 in words is "twenty-five million, two hundred nine thousand, five hundred twenty-five".