25405525 has 6 divisors (see below), whose sum is σ = 31502882. Its totient is φ = 20324400.

The previous prime is 25405519. The next prime is 25405571. The reversal of 25405525 is 52550452.

It can be written as a sum of positive squares in 3 ways, for example, as 1522756 + 23882769 = 1234^2 + 4887^2 .

It is not a de Polignac number, because 25405525 - 2³ = 25405517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25405493 and 25405502.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 508086 + ... + 508135.

Almost surely, 2^25405525 is an apocalyptic number.

25405525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25405525 is a deficient number, since it is larger than the sum of its proper divisors (6097357).

25405525 is a wasteful number, since it uses less digits than its factorization.

25405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016231 (or 1016226 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 25405525 is about 5040.3893698801. The cubic root of 25405525 is about 293.9743178702.

Adding to 25405525 its reverse (52550452), we get a palindrome (77955977).

The spelling of 25405525 in words is "twenty-five million, four hundred five thousand, five hundred twenty-five".