25612009 has 8 divisors (see below), whose sum is σ = 26138952. Its totient is φ = 25088640.

The previous prime is 25611997. The next prime is 25612051. The reversal of 25612009 is 90021652.

It can be written as a sum of positive squares in 4 ways, for example, as 6906384 + 18705625 = 2628^2 + 4325^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25612009 - 2⁹ = 25611497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25612079) 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, 17157 + ... + 18589.

It is an arithmetic number, because the mean of its divisors is an integer number (3267369).

Almost surely, 2^25612009 is an apocalyptic number.

It is an amenable number.

25612009 is a deficient number, since it is larger than the sum of its proper divisors (526943).

25612009 is a wasteful number, since it uses less digits than its factorization.

25612009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 25612009 is about 5060.8308606394. The cubic root of 25612009 is about 294.7685976185.

The spelling of 25612009 in words is "twenty-five million, six hundred twelve thousand, nine".