25561117 has 4 divisors (see below), whose sum is σ = 26251996. Its totient is φ = 24870240.

The previous prime is 25561079. The next prime is 25561139. The reversal of 25561117 is 71116552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24147396 + 1413721 = 4914^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561117 - 2⁷ = 25560989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561147) 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, 345384 + ... + 345457.

It is an arithmetic number, because the mean of its divisors is an integer number (6562999).

Almost surely, 2^25561117 is an apocalyptic number.

It is an amenable number.

25561117 is a deficient number, since it is larger than the sum of its proper divisors (690879).

25561117 is an equidigital number, since it uses as much as digits as its factorization.

25561117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690878.

The product of its digits is 2100, while the sum is 28.

The square root of 25561117 is about 5055.8003322916. The cubic root of 25561117 is about 294.5732294933.

Adding to 25561117 its reverse (71116552), we get a palindrome (96677669).

The spelling of 25561117 in words is "twenty-five million, five hundred sixty-one thousand, one hundred seventeen".