25555891 has 4 divisors (see below), whose sum is σ = 25569432. Its totient is φ = 25542352.

The previous prime is 25555883. The next prime is 25555903. The reversal of 25555891 is 19855552.

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 25555891 - 2³ = 25555883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25555801) 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, 3370 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (6392358).

Almost surely, 2^25555891 is an apocalyptic number.

25555891 is a deficient number, since it is larger than the sum of its proper divisors (13541).

25555891 is a wasteful number, since it uses less digits than its factorization.

25555891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13540.

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

The square root of 25555891 is about 5055.2834737530. The cubic root of 25555891 is about 294.5531528456.

The spelling of 25555891 in words is "twenty-five million, five hundred fifty-five thousand, eight hundred ninety-one".