25535881 has 16 divisors (see below), whose sum is σ = 30077440. Its totient is φ = 21228480.

The previous prime is 25535869. The next prime is 25535891. The reversal of 25535881 is 18853552.

It is not a de Polignac number, because 25535881 - 2⁹ = 25535369 is a prime.

It is a super-2 number, since 2×25535881² = 1304162436892322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25535881.

It is not an unprimeable number, because it can be changed into a prime (25535821) 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 15 ways as a sum of consecutive naturals, for example, 33355 + ... + 34111.

It is an arithmetic number, because the mean of its divisors is an integer number (1879840).

Almost surely, 2^25535881 is an apocalyptic number.

It is an amenable number.

25535881 is a deficient number, since it is larger than the sum of its proper divisors (4541559).

25535881 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (25535880) it forms an eRAP, since the sums of their prime factors are consecutive (903 and 904).

25535881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its digits is 48000, while the sum is 37.

The square root of 25535881 is about 5053.3039686922. The cubic root of 25535881 is about 294.4762554084.

The spelling of 25535881 in words is "twenty-five million, five hundred thirty-five thousand, eight hundred eighty-one".