25205225 has 6 divisors (see below), whose sum is σ = 31254510. Its totient is φ = 20164160.

The previous prime is 25205209. The next prime is 25205239. The reversal of 25205225 is 52250252.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1982464 + 23222761 = 1408^2 + 4819^2 .

It is not a de Polignac number, because 25205225 - 2⁴ = 25205209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25205225.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 504080 + ... + 504129.

It is an arithmetic number, because the mean of its divisors is an integer number (5209085).

Almost surely, 2^25205225 is an apocalyptic number.

25205225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25205225 is a deficient number, since it is larger than the sum of its proper divisors (6049285).

25205225 is a wasteful number, since it uses less digits than its factorization.

25205225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008219 (or 1008214 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 25205225 is about 5020.4805546880. The cubic root of 25205225 is about 293.1997031080.

Adding to 25205225 its reverse (52250252), we get a palindrome (77455477).

The spelling of 25205225 in words is "twenty-five million, two hundred five thousand, two hundred twenty-five".