25172505 has 32 divisors (see below), whose sum is σ = 45024000. Its totient is φ = 13343616.

The previous prime is 25172491. The next prime is 25172561. The reversal of 25172505 is 50527152.

It is a happy number.

It is not a de Polignac number, because 25172505 - 2⁸ = 25172249 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26397 + ... + 27333.

It is an arithmetic number, because the mean of its divisors is an integer number (1407000).

Almost surely, 2^25172505 is an apocalyptic number.

It is an amenable number.

25172505 is a deficient number, since it is larger than the sum of its proper divisors (19851495).

25172505 is a wasteful number, since it uses less digits than its factorization.

25172505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 25172505 is about 5017.2208442523. The cubic root of 25172505 is about 293.0727764023.

Adding to 25172505 its reverse (50527152), we get a palindrome (75699657).

The spelling of 25172505 in words is "twenty-five million, one hundred seventy-two thousand, five hundred five".