25561245 has 32 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 13122560.

The previous prime is 25561243. The next prime is 25561247. The reversal of 25561245 is 54216552.

It is an interprime number because it is at equal distance from previous prime (25561243) and next prime (25561247).

It is not a de Polignac number, because 25561245 - 2¹ = 25561243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54502 + ... + 54968.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^25561245 is an apocalyptic number.

It is an amenable number.

25561245 is a deficient number, since it is larger than the sum of its proper divisors (16895715).

25561245 is a wasteful number, since it uses less digits than its factorization.

25561245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its digits is 12000, while the sum is 30.

The square root of 25561245 is about 5055.8129910035. The cubic root of 25561245 is about 294.5737211947.

Adding to 25561245 its reverse (54216552), we get a palindrome (79777797).

It can be divided in two parts, 25 and 561245, that added together give a triangular number (561270 = T₁₀₅₉).

The spelling of 25561245 in words is "twenty-five million, five hundred sixty-one thousand, two hundred forty-five".