25575509 has 2 divisors, whose sum is σ = 25575510. Its totient is φ = 25575508.

The previous prime is 25575493. The next prime is 25575541. The reversal of 25575509 is 90557552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 9132484 = 4055^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 25575509 - 2⁴ = 25575493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25575569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12787754 + 12787755.

It is an arithmetic number, because the mean of its divisors is an integer number (12787755).

Almost surely, 2^25575509 is an apocalyptic number.

It is an amenable number.

25575509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25575509 is an equidigital number, since it uses as much as digits as its factorization.

25575509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78750, while the sum is 38.

The square root of 25575509 is about 5057.2234477033. The cubic root of 25575509 is about 294.6285048880.

The spelling of 25575509 in words is "twenty-five million, five hundred seventy-five thousand, five hundred nine".