25082509 has 4 divisors (see below), whose sum is σ = 25093216. Its totient is φ = 25071804.

The previous prime is 25082501. The next prime is 25082513. The reversal of 25082509 is 90528052.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25082509 - 2³ = 25082501 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 (25082501) 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, 159 + ... + 7084.

It is an arithmetic number, because the mean of its divisors is an integer number (6273304).

Almost surely, 2^25082509 is an apocalyptic number.

It is an amenable number.

25082509 is a deficient number, since it is larger than the sum of its proper divisors (10707).

25082509 is an equidigital number, since it uses as much as digits as its factorization.

25082509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10706.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 25082509 is about 5008.2441034758. The cubic root of 25082509 is about 292.7230976248.

The spelling of 25082509 in words is "twenty-five million, eighty-two thousand, five hundred nine".