25652209 has 16 divisors (see below), whose sum is σ = 28885824. Its totient is φ = 22579200.

The previous prime is 25652189. The next prime is 25652233. The reversal of 25652209 is 90225652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25652209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25652239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91149 + ... + 91429.

It is an arithmetic number, because the mean of its divisors is an integer number (1805364).

Almost surely, 2^25652209 is an apocalyptic number.

It is an amenable number.

25652209 is a deficient number, since it is larger than the sum of its proper divisors (3233615).

25652209 is a wasteful number, since it uses less digits than its factorization.

25652209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 25652209 is about 5064.8009832569. The cubic root of 25652209 is about 294.9227375945.

It can be divided in two parts, 2565 and 2209, that added together give a palindrome (4774).

The spelling of 25652209 in words is "twenty-five million, six hundred fifty-two thousand, two hundred nine".