25431009 has 8 divisors (see below), whose sum is σ = 34237632. Its totient is φ = 16789200.

The previous prime is 25431001. The next prime is 25431013. The reversal of 25431009 is 90013452.

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

It is not a de Polignac number, because 25431009 - 2³ = 25431001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25431009.

It is not an unprimeable number, because it can be changed into a prime (25431001) 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, 40842 + ... + 41459.

It is an arithmetic number, because the mean of its divisors is an integer number (4279704).

Almost surely, 2^25431009 is an apocalyptic number.

It is an amenable number.

25431009 is a deficient number, since it is larger than the sum of its proper divisors (8806623).

25431009 is a wasteful number, since it uses less digits than its factorization.

25431009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82407.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 25431009 is about 5042.9167155526. The cubic root of 25431009 is about 294.0725791471.

The spelling of 25431009 in words is "twenty-five million, four hundred thirty-one thousand, nine".