25559447 has 2 divisors, whose sum is σ = 25559448. Its totient is φ = 25559446.

The previous prime is 25559437. The next prime is 25559453. The reversal of 25559447 is 74495552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25559447 - 2⁶ = 25559383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25559437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779723 + 12779724.

It is an arithmetic number, because the mean of its divisors is an integer number (12779724).

Almost surely, 2^25559447 is an apocalyptic number.

25559447 is a deficient number, since it is larger than the sum of its proper divisors (1).

25559447 is an equidigital number, since it uses as much as digits as its factorization.

25559447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 41.

The square root of 25559447 is about 5055.6351727552. The cubic root of 25559447 is about 294.5668141763.

The spelling of 25559447 in words is "twenty-five million, five hundred fifty-nine thousand, four hundred forty-seven".