25804531 has 4 divisors (see below), whose sum is σ = 25816864. Its totient is φ = 25792200.

The previous prime is 25804433. The next prime is 25804543. The reversal of 25804531 is 13540852.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25804531 - 2⁹ = 25804019 is a prime.

It is a super-2 number, since 2×25804531² = 1331747640259922, 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 25804531.

It is not an unprimeable number, because it can be changed into a prime (25804631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2160 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (6454216).

Almost surely, 2^25804531 is an apocalyptic number.

25804531 is a deficient number, since it is larger than the sum of its proper divisors (12333).

25804531 is an equidigital number, since it uses as much as digits as its factorization.

25804531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12332.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 25804531 is about 5079.8160399763. The cubic root of 25804531 is about 295.5053332409.

It can be divided in two parts, 25804 and 531, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 25804531 in words is "twenty-five million, eight hundred four thousand, five hundred thirty-one".