25604009 has 2 divisors, whose sum is σ = 25604010. Its totient is φ = 25604008.

The previous prime is 25604003. The next prime is 25604021. The reversal of 25604009 is 90040652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14845609 + 10758400 = 3853^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 25604009 - 2⁴ = 25603993 is a prime.

It is not a weakly prime, because it can be changed into another prime (25604003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802004 + 12802005.

It is an arithmetic number, because the mean of its divisors is an integer number (12802005).

Almost surely, 2^25604009 is an apocalyptic number.

It is an amenable number.

25604009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25604009 is an equidigital number, since it uses as much as digits as its factorization.

25604009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25604009 is about 5060.0404148584. The cubic root of 25604009 is about 294.7379037573.

The spelling of 25604009 in words is "twenty-five million, six hundred four thousand, nine".