25591559 has 4 divisors (see below), whose sum is σ = 29247504. Its totient is φ = 21935616.

The previous prime is 25591541. The next prime is 25591561. The reversal of 25591559 is 95519552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25591559 - 2⁸ = 25591303 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25591519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1827962 + ... + 1827975.

It is an arithmetic number, because the mean of its divisors is an integer number (7311876).

Almost surely, 2^25591559 is an apocalyptic number.

25591559 is a deficient number, since it is larger than the sum of its proper divisors (3655945).

25591559 is an equidigital number, since it uses as much as digits as its factorization.

25591559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655944.

The product of its digits is 101250, while the sum is 41.

The square root of 25591559 is about 5058.8100379437. The cubic root of 25591559 is about 294.6901237159.

The spelling of 25591559 in words is "twenty-five million, five hundred ninety-one thousand, five hundred fifty-nine".