2556881 has 4 divisors (see below), whose sum is σ = 2585700. Its totient is φ = 2528064.

The previous prime is 2556877. The next prime is 2556907. The reversal of 2556881 is 1886552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 707281 + 1849600 = 841^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556881 - 2² = 2556877 is a prime.

It is a super-2 number, since 2×2556881² = 13075280896322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556821) 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, 14276 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (646425).

2^2556881 is an apocalyptic number.

It is an amenable number.

2556881 is a deficient number, since it is larger than the sum of its proper divisors (28819).

2556881 is an equidigital number, since it uses as much as digits as its factorization.

2556881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28818.

The product of its digits is 19200, while the sum is 35.

The square root of 2556881 is about 1599.0250154391. The cubic root of 2556881 is about 136.7424967503.

The spelling of 2556881 in words is "two million, five hundred fifty-six thousand, eight hundred eighty-one".