25209245 has 4 divisors (see below), whose sum is σ = 30251100. Its totient is φ = 20167392.

The previous prime is 25209241. The next prime is 25209251. The reversal of 25209245 is 54290252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 7409284 = 4219^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 25209245 - 2² = 25209241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25209241) 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 3 ways as a sum of consecutive naturals, for example, 2520920 + ... + 2520929.

It is an arithmetic number, because the mean of its divisors is an integer number (7562775).

Almost surely, 2^25209245 is an apocalyptic number.

It is an amenable number.

25209245 is a deficient number, since it is larger than the sum of its proper divisors (5041855).

25209245 is an equidigital number, since it uses as much as digits as its factorization.

25209245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041854.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25209245 is about 5020.8808988065. The cubic root of 25209245 is about 293.2152898253.

Adding to 25209245 its reverse (54290252), we get a palindrome (79499497).

The spelling of 25209245 in words is "twenty-five million, two hundred nine thousand, two hundred forty-five".