2557831 has 4 divisors (see below), whose sum is σ = 2561112. Its totient is φ = 2554552.

The previous prime is 2557823. The next prime is 2557843. The reversal of 2557831 is 1387552.

2557831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2557831 - 2³ = 2557823 is a prime.

It is a super-2 number, since 2×2557831² = 13084998849122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2557793 and 2557802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (640278).

2^2557831 is an apocalyptic number.

2557831 is the 1012-nd centered pentagonal number.

2557831 is a deficient number, since it is larger than the sum of its proper divisors (3281).

2557831 is a wasteful number, since it uses less digits than its factorization.

2557831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280.

The product of its digits is 8400, while the sum is 31.

The square root of 2557831 is about 1599.3220438673. The cubic root of 2557831 is about 136.7594300486.

The spelling of 2557831 in words is "two million, five hundred fifty-seven thousand, eight hundred thirty-one".