2781263 has 4 divisors (see below), whose sum is σ = 2784600. Its totient is φ = 2777928.

The previous prime is 2781221. The next prime is 2781271. The reversal of 2781263 is 3621872.

It is a happy number.

2781263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, 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 2781263 - 2⁶ = 2781199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788 + ... + 2486.

It is an arithmetic number, because the mean of its divisors is an integer number (696150).

2^2781263 is an apocalyptic number.

2781263 is a deficient number, since it is larger than the sum of its proper divisors (3337).

2781263 is a wasteful number, since it uses less digits than its factorization.

2781263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336.

The product of its digits is 4032, while the sum is 29.

The square root of 2781263 is about 1667.7119055760. The cubic root of 2781263 is about 140.6308773181.

The spelling of 2781263 in words is "two million, seven hundred eighty-one thousand, two hundred sixty-three".