25539009 has 16 divisors (see below), whose sum is σ = 35303424. Its totient is φ = 16405200.

The previous prime is 25538969. The next prime is 25539013. The reversal of 25539009 is 90093552.

It is not a de Polignac number, because 25539009 - 2⁷ = 25538881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25539029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28482 + ... + 29364.

It is an arithmetic number, because the mean of its divisors is an integer number (2206464).

Almost surely, 2^25539009 is an apocalyptic number.

It is an amenable number.

25539009 is a deficient number, since it is larger than the sum of its proper divisors (9764415).

25539009 is a wasteful number, since it uses less digits than its factorization.

25539009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 25539009 is about 5053.6134596940. The cubic root of 25539009 is about 294.4882788055.

The spelling of 25539009 in words is "twenty-five million, five hundred thirty-nine thousand, nine".