25559891 has 8 divisors (see below), whose sum is σ = 30929760. Its totient is φ = 20619648.

The previous prime is 25559879. The next prime is 25559951. The reversal of 25559891 is 19895552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25559891 - 2⁶ = 25559827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25559801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107276 + ... + 107513.

It is an arithmetic number, because the mean of its divisors is an integer number (3866220).

Almost surely, 2^25559891 is an apocalyptic number.

25559891 is a deficient number, since it is larger than the sum of its proper divisors (5369869).

25559891 is a wasteful number, since it uses less digits than its factorization.

25559891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214813.

The product of its digits is 162000, while the sum is 44.

The square root of 25559891 is about 5055.6790839609. The cubic root of 25559891 is about 294.5685198328.

The spelling of 25559891 in words is "twenty-five million, five hundred fifty-nine thousand, eight hundred ninety-one".