25581559 has 2 divisors, whose sum is σ = 25581560. Its totient is φ = 25581558.

The previous prime is 25581553. The next prime is 25581601. The reversal of 25581559 is 95518552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25581559 - 2³ = 25581551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25581551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790779 + 12790780.

It is an arithmetic number, because the mean of its divisors is an integer number (12790780).

Almost surely, 2^25581559 is an apocalyptic number.

25581559 is a deficient number, since it is larger than the sum of its proper divisors (1).

25581559 is an equidigital number, since it uses as much as digits as its factorization.

25581559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90000, while the sum is 40.

The square root of 25581559 is about 5057.8215666431. The cubic root of 25581559 is about 294.6517349493.

The spelling of 25581559 in words is "twenty-five million, five hundred eighty-one thousand, five hundred fifty-nine".