25105525 has 6 divisors (see below), whose sum is σ = 31130882. Its totient is φ = 20084400.

The previous prime is 25105523. The next prime is 25105537. The reversal of 25105525 is 52550152.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2007889 + 23097636 = 1417^2 + 4806^2 .

It is not a de Polignac number, because 25105525 - 2¹ = 25105523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1004221 = 25105525 / (2 + 5 + 1 + 0 + 5 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25105525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25105523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 502086 + ... + 502135.

Almost surely, 2^25105525 is an apocalyptic number.

25105525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25105525 is a deficient number, since it is larger than the sum of its proper divisors (6025357).

25105525 is a wasteful number, since it uses less digits than its factorization.

25105525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004231 (or 1004226 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25105525 is about 5010.5413879141. The cubic root of 25105525 is about 292.8126056178.

Adding to 25105525 its reverse (52550152), we get a palindrome (77655677).

The spelling of 25105525 in words is "twenty-five million, one hundred five thousand, five hundred twenty-five".