25521225 has 12 divisors (see below), whose sum is σ = 42195216. Its totient is φ = 13611280.

The previous prime is 25521211. The next prime is 25521227. The reversal of 25521225 is 52212552.

It is not a de Polignac number, because 25521225 - 2⁵ = 25521193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25521195 and 25521204.

It is not an unprimeable number, because it can be changed into a prime (25521227) 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 11 ways as a sum of consecutive naturals, for example, 170067 + ... + 170216.

It is an arithmetic number, because the mean of its divisors is an integer number (3516268).

Almost surely, 2^25521225 is an apocalyptic number.

25521225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25521225 is a deficient number, since it is larger than the sum of its proper divisors (16673991).

25521225 is a wasteful number, since it uses less digits than its factorization.

25521225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340296 (or 340291 counting only the distinct ones).

The product of its digits is 2000, while the sum is 24.

The square root of 25521225 is about 5051.8536202071. The cubic root of 25521225 is about 294.4199076372.

Adding to 25521225 its reverse (52212552), we get a palindrome (77733777).

The spelling of 25521225 in words is "twenty-five million, five hundred twenty-one thousand, two hundred twenty-five".