25215525 has 18 divisors (see below), whose sum is σ = 45164210. Its totient is φ = 13448160.

The previous prime is 25215503. The next prime is 25215557. The reversal of 25215525 is 52551252.

It can be written as a sum of positive squares in 3 ways, for example, as 1185921 + 24029604 = 1089^2 + 4902^2 .

It is not a de Polignac number, because 25215525 - 2¹² = 25211429 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 55810 + ... + 56259.

Almost surely, 2^25215525 is an apocalyptic number.

25215525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25215525 is a deficient number, since it is larger than the sum of its proper divisors (19948685).

25215525 is a wasteful number, since it uses less digits than its factorization.

25215525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112085 (or 112077 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 25215525 is about 5021.5062481291. The cubic root of 25215525 is about 293.2396359086.

Adding to 25215525 its reverse (52551252), we get a palindrome (77766777).

The spelling of 25215525 in words is "twenty-five million, two hundred fifteen thousand, five hundred twenty-five".