25209225 has 60 divisors (see below), whose sum is σ = 47712720. Its totient is φ = 13154400.

The previous prime is 25209211. The next prime is 25209227. The reversal of 25209225 is 52290252.

It is not a de Polignac number, because 25209225 - 2⁷ = 25209097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25209227) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 119370 + ... + 119580.

It is an arithmetic number, because the mean of its divisors is an integer number (795212).

Almost surely, 2^25209225 is an apocalyptic number.

25209225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25209225 is a deficient number, since it is larger than the sum of its proper divisors (22503495).

25209225 is a wasteful number, since it uses less digits than its factorization.

25209225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25209225 is about 5020.8789071237. The cubic root of 25209225 is about 293.2152122835.

Adding to 25209225 its reverse (52290252), we get a palindrome (77499477).

The spelling of 25209225 in words is "twenty-five million, two hundred nine thousand, two hundred twenty-five".