2556111 has 4 divisors (see below), whose sum is σ = 3408152. Its totient is φ = 1704072.

The previous prime is 2556107. The next prime is 2556121. The reversal of 2556111 is 1116552.

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

It is not a de Polignac number, because 2556111 - 2² = 2556107 is a prime.

It is a D-number.

It is a Duffinian number.

2556111 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556101) 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, 426016 + ... + 426021.

It is an arithmetic number, because the mean of its divisors is an integer number (852038).

2^2556111 is an apocalyptic number.

2556111 is a deficient number, since it is larger than the sum of its proper divisors (852041).

2556111 is an equidigital number, since it uses as much as digits as its factorization.

2556111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852040.

The product of its digits is 300, while the sum is 21.

The square root of 2556111 is about 1598.7842255914. The cubic root of 2556111 is about 136.7287687885.

The spelling of 2556111 in words is "two million, five hundred fifty-six thousand, one hundred eleven".