25052009 has 4 divisors (see below), whose sum is σ = 25140816. Its totient is φ = 24963204.

The previous prime is 25052003. The next prime is 25052011. The reversal of 25052009 is 90025052.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 25052009 - 2¹⁶ = 24986473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25052003) 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, 43979 + ... + 44544.

It is an arithmetic number, because the mean of its divisors is an integer number (6285204).

Almost surely, 2^25052009 is an apocalyptic number.

It is an amenable number.

25052009 is a deficient number, since it is larger than the sum of its proper divisors (88807).

25052009 is an equidigital number, since it uses as much as digits as its factorization.

25052009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88806.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 25052009 is about 5005.1981978739. The cubic root of 25052009 is about 292.6044003589.

The spelling of 25052009 in words is "twenty-five million, fifty-two thousand, nine".