25631121 has 32 divisors (see below), whose sum is σ = 38085120. Its totient is φ = 15314688.

The previous prime is 25631117. The next prime is 25631143. The reversal of 25631121 is 12113652.

It is not a de Polignac number, because 25631121 - 2² = 25631117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 545320 + ... + 545366.

It is an arithmetic number, because the mean of its divisors is an integer number (1190160).

Almost surely, 2^25631121 is an apocalyptic number.

It is an amenable number.

25631121 is a deficient number, since it is larger than the sum of its proper divisors (12453999).

25631121 is an equidigital number, since it uses as much as digits as its factorization.

25631121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 104 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 25631121 is about 5062.7187360153. The cubic root of 25631121 is about 294.8418993878.

Adding to 25631121 its reverse (12113652), we get a palindrome (37744773).

It can be divided in two parts, 25631 and 121, that added together give a palindrome (25752).

The spelling of 25631121 in words is "twenty-five million, six hundred thirty-one thousand, one hundred twenty-one".