25825809 has 4 divisors (see below), whose sum is σ = 34434416. Its totient is φ = 17217204.

The previous prime is 25825799. The next prime is 25825817. The reversal of 25825809 is 90852852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25825809 - 2¹¹ = 25823761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25825819) 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, 4304299 + ... + 4304304.

It is an arithmetic number, because the mean of its divisors is an integer number (8608604).

Almost surely, 2^25825809 is an apocalyptic number.

It is an amenable number.

25825809 is a deficient number, since it is larger than the sum of its proper divisors (8608607).

25825809 is an equidigital number, since it uses as much as digits as its factorization.

25825809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8608606.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 25825809 is about 5081.9099755899. The cubic root of 25825809 is about 295.5865339030.

The spelling of 25825809 in words is "twenty-five million, eight hundred twenty-five thousand, eight hundred nine".