25530559 has 2 divisors, whose sum is σ = 25530560. Its totient is φ = 25530558.

The previous prime is 25530553. The next prime is 25530569. The reversal of 25530559 is 95503552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25530559 - 2¹¹ = 25528511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25530553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765279 + 12765280.

It is an arithmetic number, because the mean of its divisors is an integer number (12765280).

Almost surely, 2^25530559 is an apocalyptic number.

25530559 is a deficient number, since it is larger than the sum of its proper divisors (1).

25530559 is an equidigital number, since it uses as much as digits as its factorization.

25530559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33750, while the sum is 34.

The square root of 25530559 is about 5052.7773550791. Note that the first 3 decimals coincide. The cubic root of 25530559 is about 294.4557964638.

The spelling of 25530559 in words is "twenty-five million, five hundred thirty thousand, five hundred fifty-nine".