25561417 has 8 divisors (see below), whose sum is σ = 29444096. Its totient is φ = 21736512.

The previous prime is 25561411. The next prime is 25561433. The reversal of 25561417 is 71416552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25561417 - 2¹⁵ = 25528649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13488 + ... + 15265.

It is an arithmetic number, because the mean of its divisors is an integer number (3680512).

Almost surely, 2^25561417 is an apocalyptic number.

It is an amenable number.

25561417 is a deficient number, since it is larger than the sum of its proper divisors (3882679).

25561417 is a wasteful number, since it uses less digits than its factorization.

25561417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28887.

The product of its digits is 8400, while the sum is 31.

The square root of 25561417 is about 5055.8300010977. The cubic root of 25561417 is about 294.5743819159.

Adding to 25561417 its reverse (71416552), we get a palindrome (96977969).

The spelling of 25561417 in words is "twenty-five million, five hundred sixty-one thousand, four hundred seventeen".