25655631 has 16 divisors (see below), whose sum is σ = 35804160. Its totient is φ = 16320960.

The previous prime is 25655629. The next prime is 25655653. The reversal of 25655631 is 13655652.

It is not a de Polignac number, because 25655631 - 2¹ = 25655629 is a prime.

It is a super-2 number, since 2×25655631² = 1316422804016322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25655592 and 25655601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4900 + ... + 8678.

It is an arithmetic number, because the mean of its divisors is an integer number (2237760).

Almost surely, 2^25655631 is an apocalyptic number.

25655631 is a deficient number, since it is larger than the sum of its proper divisors (10148529).

25655631 is a wasteful number, since it uses less digits than its factorization.

25655631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886.

The product of its digits is 27000, while the sum is 33.

The square root of 25655631 is about 5065.1387937548. The cubic root of 25655631 is about 294.9358512245.

The spelling of 25655631 in words is "twenty-five million, six hundred fifty-five thousand, six hundred thirty-one".