25172445 has 16 divisors (see below), whose sum is σ = 40635072. Its totient is φ = 13305600.

The previous prime is 25172437. The next prime is 25172449. The reversal of 25172445 is 54427152.

It is not a de Polignac number, because 25172445 - 2³ = 25172437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25172449) 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 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 9120.

It is an arithmetic number, because the mean of its divisors is an integer number (2539692).

Almost surely, 2^25172445 is an apocalyptic number.

It is an amenable number.

25172445 is a deficient number, since it is larger than the sum of its proper divisors (15462627).

25172445 is a wasteful number, since it uses less digits than its factorization.

25172445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14972.

The product of its digits is 11200, while the sum is 30.

The square root of 25172445 is about 5017.2148648428. The cubic root of 25172445 is about 293.0725435506.

Adding to 25172445 its reverse (54427152), we get a palindrome (79599597).

The spelling of 25172445 in words is "twenty-five million, one hundred seventy-two thousand, four hundred forty-five".