2781055 has 4 divisors (see below), whose sum is σ = 3337272. Its totient is φ = 2224840.

The previous prime is 2781029. The next prime is 2781059. The reversal of 2781055 is 5501872.

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

It is not a de Polignac number, because 2781055 - 2¹⁵ = 2748287 is a prime.

It is a Duffinian number.

2781055 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781059) 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, 278101 + ... + 278110.

It is an arithmetic number, because the mean of its divisors is an integer number (834318).

2^2781055 is an apocalyptic number.

2781055 is a deficient number, since it is larger than the sum of its proper divisors (556217).

2781055 is an equidigital number, since it uses as much as digits as its factorization.

2781055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556216.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 2781055 is about 1667.6495435193. The cubic root of 2781055 is about 140.6273714826.

The spelling of 2781055 in words is "two million, seven hundred eighty-one thousand, fifty-five".