25861225 has 18 divisors (see below), whose sum is σ = 34730106. Its totient is φ = 19094400.

The previous prime is 25861219. The next prime is 25861247. The reversal of 25861225 is 52216852.

It can be written as a sum of positive squares in 9 ways, for example, as 21455424 + 4405801 = 4632^2 + 2099^2 .

It is not a de Polignac number, because 25861225 - 2⁵ = 25861193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1165 + ... + 7285.

Almost surely, 2^25861225 is an apocalyptic number.

25861225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25861225 is a deficient number, since it is larger than the sum of its proper divisors (8868881).

25861225 is a wasteful number, since it uses less digits than its factorization.

25861225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6157 (or 6139 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 25861225 is about 5085.3932984578. The cubic root of 25861225 is about 295.7215888660.

The spelling of 25861225 in words is "twenty-five million, eight hundred sixty-one thousand, two hundred twenty-five".