25522009 has 4 divisors (see below), whose sum is σ = 25584820. Its totient is φ = 25459200.

The previous prime is 25521983. The next prime is 25522033. The reversal of 25522009 is 90022552.

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 24206400 + 1315609 = 4920^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 25522009 - 2⁹ = 25521497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25522039) 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, 30792 + ... + 31609.

It is an arithmetic number, because the mean of its divisors is an integer number (6396205).

Almost surely, 2^25522009 is an apocalyptic number.

It is an amenable number.

25522009 is a deficient number, since it is larger than the sum of its proper divisors (62811).

25522009 is an equidigital number, since it uses as much as digits as its factorization.

25522009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62810.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 25522009 is about 5051.9312148920. The cubic root of 25522009 is about 294.4229224199.

The spelling of 25522009 in words is "twenty-five million, five hundred twenty-two thousand, nine".