25005509 has 2 divisors, whose sum is σ = 25005510. Its totient is φ = 25005508.

The previous prime is 25005473. The next prime is 25005517. The reversal of 25005509 is 90550052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23961025 + 1044484 = 4895^2 + 1022^2 .

It is a cyclic number.

It is not a de Polignac number, because 25005509 - 2²⁴ = 8228293 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25005109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12502754 + 12502755.

It is an arithmetic number, because the mean of its divisors is an integer number (12502755).

Almost surely, 2^25005509 is an apocalyptic number.

It is an amenable number.

25005509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25005509 is an equidigital number, since it uses as much as digits as its factorization.

25005509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 25005509 is about 5000.5508696543. The cubic root of 25005509 is about 292.4232501288.

The spelling of 25005509 in words is "twenty-five million, five thousand, five hundred nine".