25506115 has 4 divisors (see below), whose sum is σ = 30607344. Its totient is φ = 20404888.

The previous prime is 25506079. The next prime is 25506119. The reversal of 25506115 is 51160552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25506115 - 2¹¹ = 25504067 is a prime.

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 25506115.

It is not an unprimeable number, because it can be changed into a prime (25506119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550607 + ... + 2550616.

It is an arithmetic number, because the mean of its divisors is an integer number (7651836).

Almost surely, 2^25506115 is an apocalyptic number.

25506115 is a deficient number, since it is larger than the sum of its proper divisors (5101229).

25506115 is an equidigital number, since it uses as much as digits as its factorization.

25506115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101228.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 25506115 is about 5050.3579081091. The cubic root of 25506115 is about 294.3617917872.

Adding to 25506115 its reverse (51160552), we get a palindrome (76666667).

The spelling of 25506115 in words is "twenty-five million, five hundred six thousand, one hundred fifteen".