2555891 has 8 divisors (see below), whose sum is σ = 2764944. Its totient is φ = 2348640.

The previous prime is 2555881. The next prime is 2555893. The reversal of 2555891 is 1985552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2555891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2555893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5240 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (345618).

2^2555891 is an apocalyptic number.

2555891 is a deficient number, since it is larger than the sum of its proper divisors (209053).

2555891 is a wasteful number, since it uses less digits than its factorization.

2555891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901.

The product of its digits is 18000, while the sum is 35.

The square root of 2555891 is about 1598.7154218309. The cubic root of 2555891 is about 136.7248460074.

The spelling of 2555891 in words is "two million, five hundred fifty-five thousand, eight hundred ninety-one".