25971609 has 8 divisors (see below), whose sum is σ = 34663072. Its totient is φ = 17297280.

The previous prime is 25971601. The next prime is 25971619. The reversal of 25971609 is 90617952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25971609 - 2³ = 25971601 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 (25971601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184 + ... + 7209.

It is an arithmetic number, because the mean of its divisors is an integer number (4332884).

Almost surely, 2^25971609 is an apocalyptic number.

It is an amenable number.

25971609 is a deficient number, since it is larger than the sum of its proper divisors (8691463).

25971609 is a wasteful number, since it uses less digits than its factorization.

25971609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8567.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 25971609 is about 5096.2347865851. The cubic root of 25971609 is about 296.1417365090.

The spelling of 25971609 in words is "twenty-five million, nine hundred seventy-one thousand, six hundred nine".