25112509 has 4 divisors (see below), whose sum is σ = 26434240. Its totient is φ = 23790780.

The previous prime is 25112501. The next prime is 25112551. The reversal of 25112509 is 90521152.

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 25112509 - 2³ = 25112501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25112501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660837 + ... + 660874.

It is an arithmetic number, because the mean of its divisors is an integer number (6608560).

Almost surely, 2^25112509 is an apocalyptic number.

It is an amenable number.

25112509 is a deficient number, since it is larger than the sum of its proper divisors (1321731).

25112509 is a wasteful number, since it uses less digits than its factorization.

25112509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321730.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 25112509 is about 5011.2382701285. The cubic root of 25112509 is about 292.8397552012.

The spelling of 25112509 in words is "twenty-five million, one hundred twelve thousand, five hundred nine".