25521425 has 12 divisors (see below), whose sum is σ = 31771776. Its totient is φ = 20336400.

The previous prime is 25521413. The next prime is 25521469. The reversal of 25521425 is 52412552.

It is not a de Polignac number, because 25521425 - 2⁴ = 25521409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25521394 and 25521403.

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 11 ways as a sum of consecutive naturals, for example, 4892 + ... + 8658.

It is an arithmetic number, because the mean of its divisors is an integer number (2647648).

Almost surely, 2^25521425 is an apocalyptic number.

25521425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25521425 is a deficient number, since it is larger than the sum of its proper divisors (6250351).

25521425 is a wasteful number, since it uses less digits than its factorization.

25521425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4048 (or 4043 counting only the distinct ones).

The product of its digits is 4000, while the sum is 26.

The square root of 25521425 is about 5051.8734148828. The cubic root of 25521425 is about 294.4206767203.

Adding to 25521425 its reverse (52412552), we get a palindrome (77933977).

The spelling of 25521425 in words is "twenty-five million, five hundred twenty-one thousand, four hundred twenty-five".