25561135 has 16 divisors (see below), whose sum is σ = 31917600. Its totient is φ = 19635840.

The previous prime is 25561079. The next prime is 25561139. The reversal of 25561135 is 53116552.

It is not a de Polignac number, because 25561135 - 2⁷ = 25561007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561139) 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, 12141 + ... + 14089.

It is an arithmetic number, because the mean of its divisors is an integer number (1994850).

Almost surely, 2^25561135 is an apocalyptic number.

25561135 is a deficient number, since it is larger than the sum of its proper divisors (6356465).

25561135 is a wasteful number, since it uses less digits than its factorization.

25561135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058.

The product of its digits is 4500, while the sum is 28.

The square root of 25561135 is about 5055.8021124249. The cubic root of 25561135 is about 294.5732986389.

Adding to 25561135 its reverse (53116552), we get a palindrome (78677687).

The spelling of 25561135 in words is "twenty-five million, five hundred sixty-one thousand, one hundred thirty-five".