25105631 has 4 divisors (see below), whose sum is σ = 26427000. Its totient is φ = 23784264.

The previous prime is 25105609. The next prime is 25105657. The reversal of 25105631 is 13650152.

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

It is a cyclic number.

It is not a de Polignac number, because 25105631 - 2¹⁴ = 25089247 is a prime.

It is a super-2 number, since 2×25105631² = 1260585415816322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25105597 and 25105606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25105601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660656 + ... + 660693.

It is an arithmetic number, because the mean of its divisors is an integer number (6606750).

Almost surely, 2^25105631 is an apocalyptic number.

25105631 is a deficient number, since it is larger than the sum of its proper divisors (1321369).

25105631 is a wasteful number, since it uses less digits than its factorization.

25105631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321368.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 25105631 is about 5010.5519656022. The cubic root of 25105631 is about 292.8130177195.

Adding to 25105631 its reverse (13650152), we get a palindrome (38755783).

The spelling of 25105631 in words is "twenty-five million, one hundred five thousand, six hundred thirty-one".