25956609 has 16 divisors (see below), whose sum is σ = 39800832. Its totient is φ = 14739408.

The previous prime is 25956607. The next prime is 25956629. The reversal of 25956609 is 90665952.

It is not a de Polignac number, because 25956609 - 2¹ = 25956607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25956607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369 + ... + 7214.

It is an arithmetic number, because the mean of its divisors is an integer number (2487552).

Almost surely, 2^25956609 is an apocalyptic number.

It is an amenable number.

25956609 is a deficient number, since it is larger than the sum of its proper divisors (13844223).

25956609 is a wasteful number, since it uses less digits than its factorization.

25956609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 25956609 is about 5094.7628992918. The cubic root of 25956609 is about 296.0847129400.

It can be divided in two parts, 25956 and 609, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 25956609 in words is "twenty-five million, nine hundred fifty-six thousand, six hundred nine".