25689121 has 6 divisors (see below), whose sum is σ = 27112722. Its totient is φ = 24336720.

The previous prime is 25689107. The next prime is 25689143. The reversal of 25689121 is 12198652.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 2030625 = 4864^2 + 1425^2 .

It is not a de Polignac number, because 25689121 - 2⁵ = 25689089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25689161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35220 + ... + 35941.

It is an arithmetic number, because the mean of its divisors is an integer number (4518787).

Almost surely, 2^25689121 is an apocalyptic number.

It is an amenable number.

25689121 is a deficient number, since it is larger than the sum of its proper divisors (1423601).

25689121 is an equidigital number, since it uses as much as digits as its factorization.

25689121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71199 (or 71180 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 25689121 is about 5068.4436467223. The cubic root of 25689121 is about 295.0641285462.

The spelling of 25689121 in words is "twenty-five million, six hundred eighty-nine thousand, one hundred twenty-one".