25172525 has 18 divisors (see below), whose sum is σ = 36311850. Its totient is φ = 17260320.

The previous prime is 25172491. The next prime is 25172561. The reversal of 25172525 is 52527152.

It can be written as a sum of positive squares in 3 ways, for example, as 7414729 + 17757796 = 2723^2 + 4214^2 .

It is not a de Polignac number, because 25172525 - 2¹⁰ = 25171501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9050 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (2017325).

Almost surely, 2^25172525 is an apocalyptic number.

25172525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25172525 is a deficient number, since it is larger than the sum of its proper divisors (11139325).

25172525 is a wasteful number, since it uses less digits than its factorization.

25172525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20573 (or 20561 counting only the distinct ones).

The product of its digits is 7000, while the sum is 29.

The square root of 25172525 is about 5017.2228373872. Note that the first 3 decimals coincide. The cubic root of 25172525 is about 293.0728540194.

Adding to 25172525 its reverse (52527152), we get a palindrome (77699677).

The spelling of 25172525 in words is "twenty-five million, one hundred seventy-two thousand, five hundred twenty-five".