25125909 has 4 divisors (see below), whose sum is σ = 33501216. Its totient is φ = 16750604.

The previous prime is 25125901. The next prime is 25125973. The reversal of 25125909 is 90952152.

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 25125909 - 2³ = 25125901 is a prime.

It is a super-2 number, since 2×25125909² = 1262622606152562, which contains 22 as substring.

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 25125909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25125901) 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, 4187649 + ... + 4187654.

It is an arithmetic number, because the mean of its divisors is an integer number (8375304).

Almost surely, 2^25125909 is an apocalyptic number.

It is an amenable number.

25125909 is a deficient number, since it is larger than the sum of its proper divisors (8375307).

25125909 is an equidigital number, since it uses as much as digits as its factorization.

25125909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8375306.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 25125909 is about 5012.5750867194. The cubic root of 25125909 is about 292.8918322354.

The spelling of 25125909 in words is "twenty-five million, one hundred twenty-five thousand, nine hundred nine".