2556531 has 6 divisors (see below), whose sum is σ = 3692780. Its totient is φ = 1704348.

The previous prime is 2556523. The next prime is 2556559. The reversal of 2556531 is 1356552.

2556531 is a `hidden beast` number, since 2 + 5 + 5 + 653 + 1 = 666.

It is not a de Polignac number, because 2556531 - 2³ = 2556523 is a prime.

It is a super-2 number, since 2×2556531² = 13071701507922, 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 = 2556495 and 2556504.

It is not an unprimeable number, because it can be changed into a prime (2556331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142021 + ... + 142038.

2^2556531 is an apocalyptic number.

2556531 is a deficient number, since it is larger than the sum of its proper divisors (1136249).

2556531 is a wasteful number, since it uses less digits than its factorization.

2556531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284065 (or 284062 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 2556531 is about 1598.9155700036. The cubic root of 2556531 is about 136.7362571094.

It can be divided in two parts, 255 and 6531, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 2556531 in words is "two million, five hundred fifty-six thousand, five hundred thirty-one".