25125009 has 16 divisors (see below), whose sum is σ = 41231232. Its totient is φ = 13252608.

The previous prime is 25125007. The next prime is 25125017. The reversal of 25125009 is 90052152.

It is not a de Polignac number, because 25125009 - 2¹ = 25125007 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25125009.

It is not an unprimeable number, because it can be changed into a prime (25125007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45744 + ... + 46289.

It is an arithmetic number, because the mean of its divisors is an integer number (2576952).

Almost surely, 2^25125009 is an apocalyptic number.

It is an amenable number.

25125009 is a deficient number, since it is larger than the sum of its proper divisors (16106223).

25125009 is a wasteful number, since it uses less digits than its factorization.

25125009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92056.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 25125009 is about 5012.4853116992. The cubic root of 25125009 is about 292.8883351043. Note that the first 3 decimals are identical.

The spelling of 25125009 in words is "twenty-five million, one hundred twenty-five thousand, nine".