25521325 has 6 divisors (see below), whose sum is σ = 31646474. Its totient is φ = 20417040.

The previous prime is 25521281. The next prime is 25521337. The reversal of 25521325 is 52312552.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1687401 + 23833924 = 1299^2 + 4882^2 .

It is not a de Polignac number, because 25521325 - 2²¹ = 23424173 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: 1020853 = 25521325 / (2 + 5 + 5 + 2 + 1 + 3 + 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 25521325.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510402 + ... + 510451.

Almost surely, 2^25521325 is an apocalyptic number.

25521325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25521325 is a deficient number, since it is larger than the sum of its proper divisors (6125149).

25521325 is a wasteful number, since it uses less digits than its factorization.

25521325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020863 (or 1020858 counting only the distinct ones).

The product of its digits is 3000, while the sum is 25.

The square root of 25521325 is about 5051.8635175547. The cubic root of 25521325 is about 294.4202921792.

Adding to 25521325 its reverse (52312552), we get a palindrome (77833877).

It can be divided in two parts, 2 and 5521325, that multiplied together give a triangular number (11042650 = T₄₆₉₉).

The spelling of 25521325 in words is "twenty-five million, five hundred twenty-one thousand, three hundred twenty-five".