25658609 has 2 divisors, whose sum is σ = 25658610. Its totient is φ = 25658608.

The previous prime is 25658599. The next prime is 25658621. The reversal of 25658609 is 90685652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 12496225 = 3628^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 25658609 - 2²⁴ = 8881393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25658629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829304 + 12829305.

It is an arithmetic number, because the mean of its divisors is an integer number (12829305).

Almost surely, 2^25658609 is an apocalyptic number.

It is an amenable number.

25658609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25658609 is an equidigital number, since it uses as much as digits as its factorization.

25658609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 25658609 is about 5065.4327554514. The cubic root of 25658609 is about 294.9472624293.

The spelling of 25658609 in words is "twenty-five million, six hundred fifty-eight thousand, six hundred nine".