25525609 has 2 divisors, whose sum is σ = 25525610. Its totient is φ = 25525608.

The previous prime is 25525589. The next prime is 25525613. The reversal of 25525609 is 90652552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 6906384 = 4315^2 + 2628^2 .

It is a cyclic number.

It is not a de Polignac number, because 25525609 - 2¹³ = 25517417 is a prime.

It is not a weakly prime, because it can be changed into another prime (25525649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12762804 + 12762805.

It is an arithmetic number, because the mean of its divisors is an integer number (12762805).

Almost surely, 2^25525609 is an apocalyptic number.

It is an amenable number.

25525609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25525609 is an equidigital number, since it uses as much as digits as its factorization.

25525609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 25525609 is about 5052.2875017164. The cubic root of 25525609 is about 294.4367650173.

The spelling of 25525609 in words is "twenty-five million, five hundred twenty-five thousand, six hundred nine".