25649959 has 4 divisors (see below), whose sum is σ = 25660360. Its totient is φ = 25639560.

The previous prime is 25649947. The next prime is 25649977. The reversal of 25649959 is 95994652.

It is a semiprime because it is the product of two primes, 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 25649959 - 2⁷ = 25649831 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 (25649909) 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 3 ways as a sum of consecutive naturals, for example, 832 + ... + 7210.

It is an arithmetic number, because the mean of its divisors is an integer number (6415090).

Almost surely, 2^25649959 is an apocalyptic number.

25649959 is a deficient number, since it is larger than the sum of its proper divisors (10401).

25649959 is an equidigital number, since it uses as much as digits as its factorization.

25649959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400.

The product of its digits is 874800, while the sum is 49.

The square root of 25649959 is about 5064.5788571213. The cubic root of 25649959 is about 294.9141146131.

The spelling of 25649959 in words is "twenty-five million, six hundred forty-nine thousand, nine hundred fifty-nine".