25809065 has 4 divisors (see below), whose sum is σ = 30970884. Its totient is φ = 20647248.

The previous prime is 25809061. The next prime is 25809079. The reversal of 25809065 is 56090852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13920361 + 11888704 = 3731^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 25809065 - 2² = 25809061 is a prime.

It is a super-2 number, since 2×25809065² = 1332215672348450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25809061) 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 3 ways as a sum of consecutive naturals, for example, 2580902 + ... + 2580911.

It is an arithmetic number, because the mean of its divisors is an integer number (7742721).

Almost surely, 2^25809065 is an apocalyptic number.

It is an amenable number.

25809065 is a deficient number, since it is larger than the sum of its proper divisors (5161819).

25809065 is an equidigital number, since it uses as much as digits as its factorization.

25809065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161818.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 25809065 is about 5080.2622963780. The cubic root of 25809065 is about 295.5226395390.

The spelling of 25809065 in words is "twenty-five million, eight hundred nine thousand, sixty-five".