2557791 has 16 divisors (see below), whose sum is σ = 3853920. Its totient is φ = 1676160.

The previous prime is 2557781. The next prime is 2557813. The reversal of 2557791 is 1977552.

It is not a de Polignac number, because 2557791 - 2⁷ = 2557663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (240870).

2^2557791 is an apocalyptic number.

2557791 is a deficient number, since it is larger than the sum of its proper divisors (1296129).

2557791 is a wasteful number, since it uses less digits than its factorization.

2557791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1617 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 2557791 is about 1599.3095385197. The cubic root of 2557791 is about 136.7587171522.

The spelling of 2557791 in words is "two million, five hundred fifty-seven thousand, seven hundred ninety-one".