2556543 has 8 divisors (see below), whose sum is σ = 3718656. Its totient is φ = 1549400.

The previous prime is 2556523. The next prime is 2556559. The reversal of 2556543 is 3456552.

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 2556543 - 2¹⁶ = 2491007 is a prime.

It is a super-2 number, since 2×2556543² = 13071824221698, which contains 22 as substring.

2556543 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556503) 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, 38703 + ... + 38768.

It is an arithmetic number, because the mean of its divisors is an integer number (464832).

2^2556543 is an apocalyptic number.

2556543 is a deficient number, since it is larger than the sum of its proper divisors (1162113).

2556543 is a wasteful number, since it uses less digits than its factorization.

2556543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77485.

The product of its digits is 18000, while the sum is 30.

The square root of 2556543 is about 1598.9193225426. The cubic root of 2556543 is about 136.7364710493.

Subtracting 2556543 from its reverse (3456552), we obtain a palindrome (900009).

The spelling of 2556543 in words is "two million, five hundred fifty-six thousand, five hundred forty-three".