25135215 has 16 divisors (see below), whose sum is σ = 45961728. Its totient is φ = 11490336.

The previous prime is 25135213. The next prime is 25135237. The reversal of 25135215 is 51253152.

It is a happy number.

It is not a de Polignac number, because 25135215 - 2¹ = 25135213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25135213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119587 + ... + 119796.

It is an arithmetic number, because the mean of its divisors is an integer number (2872608).

Almost surely, 2^25135215 is an apocalyptic number.

25135215 is a deficient number, since it is larger than the sum of its proper divisors (20826513).

25135215 is a wasteful number, since it uses less digits than its factorization.

25135215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239398.

The product of its digits is 1500, while the sum is 24.

The square root of 25135215 is about 5013.5032661802. The cubic root of 25135215 is about 292.9279876763.

Adding to 25135215 its reverse (51253152), we get a palindrome (76388367).

The spelling of 25135215 in words is "twenty-five million, one hundred thirty-five thousand, two hundred fifteen".