25355009 has 4 divisors (see below), whose sum is σ = 25392816. Its totient is φ = 25317204.

The previous prime is 25355003. The next prime is 25355021. The reversal of 25355009 is 90055352.

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 25355009 - 2²⁰ = 24306433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25355003) 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, 17879 + ... + 19244.

It is an arithmetic number, because the mean of its divisors is an integer number (6348204).

Almost surely, 2^25355009 is an apocalyptic number.

It is an amenable number.

25355009 is a deficient number, since it is larger than the sum of its proper divisors (37807).

25355009 is an equidigital number, since it uses as much as digits as its factorization.

25355009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37806.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 25355009 is about 5035.3757555916. The cubic root of 25355009 is about 293.7793437414.

The spelling of 25355009 in words is "twenty-five million, three hundred fifty-five thousand, nine".