25906609 has 4 divisors (see below), whose sum is σ = 25936704. Its totient is φ = 25876516.

The previous prime is 25906591. The next prime is 25906631. The reversal of 25906609 is 90660952.

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 25906609 - 2¹³ = 25898417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25906649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13717 + ... + 15490.

It is an arithmetic number, because the mean of its divisors is an integer number (6484176).

Almost surely, 2^25906609 is an apocalyptic number.

It is an amenable number.

25906609 is a deficient number, since it is larger than the sum of its proper divisors (30095).

25906609 is an equidigital number, since it uses as much as digits as its factorization.

25906609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30094.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 25906609 is about 5089.8535342385. The cubic root of 25906609 is about 295.8944755636.

The spelling of 25906609 in words is "twenty-five million, nine hundred six thousand, six hundred nine".