25821841 has 6 divisors (see below), whose sum is σ = 26468726. Its totient is φ = 25190400.

The previous prime is 25821833. The next prime is 25821857. The reversal of 25821841 is 14812852.

It can be written as a sum of positive squares in 3 ways, for example, as 25600 + 25796241 = 160^2 + 5079^2 .

It is not a de Polignac number, because 25821841 - 2³ = 25821833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6000 + ... + 9361.

Almost surely, 2^25821841 is an apocalyptic number.

It is an amenable number.

25821841 is a deficient number, since it is larger than the sum of its proper divisors (646885).

25821841 is an equidigital number, since it uses as much as digits as its factorization.

25821841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15443 (or 15402 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 25821841 is about 5081.5195561958. The cubic root of 25821841 is about 295.5713946878.

It can be divided in two parts, 25821 and 841, that added together give a palindrome (26662).

The spelling of 25821841 in words is "twenty-five million, eight hundred twenty-one thousand, eight hundred forty-one".