25597009 has 4 divisors (see below), whose sum is σ = 26944240. Its totient is φ = 24249780.

The previous prime is 25596959. The next prime is 25597021. The reversal of 25597009 is 90079552.

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 25597009 - 2⁹ = 25596497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25597049) 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, 673587 + ... + 673624.

It is an arithmetic number, because the mean of its divisors is an integer number (6736060).

Almost surely, 2^25597009 is an apocalyptic number.

It is an amenable number.

25597009 is a deficient number, since it is larger than the sum of its proper divisors (1347231).

25597009 is a wasteful number, since it uses less digits than its factorization.

25597009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347230.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 25597009 is about 5059.3486734954. The cubic root of 25597009 is about 294.7110413835.

The spelling of 25597009 in words is "twenty-five million, five hundred ninety-seven thousand, nine".