2543881 has 4 divisors (see below), whose sum is σ = 2547072. Its totient is φ = 2540692.

The previous prime is 2543873. The next prime is 2543899. The reversal of 2543881 is 1883452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 2543881 - 2³ = 2543873 is a prime.

It is a super-2 number, since 2×2543881² = 12942661084322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (636768).

2^2543881 is an apocalyptic number.

It is an amenable number.

2543881 is a deficient number, since it is larger than the sum of its proper divisors (3191).

2543881 is a wasteful number, since it uses less digits than its factorization.

2543881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190.

The product of its digits is 7680, while the sum is 31.

The square root of 2543881 is about 1594.9548582954. The cubic root of 2543881 is about 136.5103553621.

The spelling of 2543881 in words is "two million, five hundred forty-three thousand, eight hundred eighty-one".