2556831 has 8 divisors (see below), whose sum is σ = 3434544. Its totient is φ = 1691840.

The previous prime is 2556821. The next prime is 2556839. The reversal of 2556831 is 1386552.

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

It is a cyclic number.

It is not a de Polignac number, because 2556831 - 2¹³ = 2548639 is a prime.

It is a super-2 number, since 2×2556831² = 13074769525122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556839) 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, 2700 + ... + 3521.

It is an arithmetic number, because the mean of its divisors is an integer number (429318).

2^2556831 is an apocalyptic number.

2556831 is a deficient number, since it is larger than the sum of its proper divisors (877713).

2556831 is a wasteful number, since it uses less digits than its factorization.

2556831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6361.

The product of its digits is 7200, while the sum is 30.

The square root of 2556831 is about 1599.0093808355. The cubic root of 2556831 is about 136.7416054079.

Subtracting from 2556831 its sum of digits (30), we obtain a square (2556801 = 1599²).

The spelling of 2556831 in words is "two million, five hundred fifty-six thousand, eight hundred thirty-one".