25015525 has 6 divisors (see below), whose sum is σ = 31019282. Its totient is φ = 20012400.

The previous prime is 25015511. The next prime is 25015531. The reversal of 25015525 is 52551052.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5602689 + 19412836 = 2367^2 + 4406^2 .

It is not a de Polignac number, because 25015525 - 2⁵ = 25015493 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: 1000621 = 25015525 / (2 + 5 + 0 + 1 + 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 25015525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 500286 + ... + 500335.

Almost surely, 2^25015525 is an apocalyptic number.

25015525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25015525 is a deficient number, since it is larger than the sum of its proper divisors (6003757).

25015525 is a wasteful number, since it uses less digits than its factorization.

25015525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000631 (or 1000626 counting only the distinct ones).

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

The square root of 25015525 is about 5001.5522590492. The cubic root of 25015525 is about 292.4622884637.

Adding to 25015525 its reverse (52551052), we get a palindrome (77566577).

The spelling of 25015525 in words is "twenty-five million, fifteen thousand, five hundred twenty-five".