25013609 has 4 divisors (see below), whose sum is σ = 25025616. Its totient is φ = 25001604.

The previous prime is 25013587. The next prime is 25013617. The reversal of 25013609 is 90631052.

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 25013609 - 2¹⁶ = 24948073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25013629) 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, 1979 + ... + 7344.

It is an arithmetic number, because the mean of its divisors is an integer number (6256404).

Almost surely, 2^25013609 is an apocalyptic number.

It is an amenable number.

25013609 is a deficient number, since it is larger than the sum of its proper divisors (12007).

25013609 is an equidigital number, since it uses as much as digits as its factorization.

25013609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 25013609 is about 5001.3607148455. The cubic root of 25013609 is about 292.4548214733.

The spelling of 25013609 in words is "twenty-five million, thirteen thousand, six hundred nine".