2781671 has 4 divisors (see below), whose sum is σ = 2785272. Its totient is φ = 2778072.

The previous prime is 2781637. The next prime is 2781677. The reversal of 2781671 is 1761872.

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 2781671 - 2¹⁰ = 2780647 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 (2781677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (696318).

2^2781671 is an apocalyptic number.

2781671 is a deficient number, since it is larger than the sum of its proper divisors (3601).

2781671 is a wasteful number, since it uses less digits than its factorization.

2781671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600.

The product of its digits is 4704, while the sum is 32.

The square root of 2781671 is about 1667.8342243760. The cubic root of 2781671 is about 140.6377536417.

The spelling of 2781671 in words is "two million, seven hundred eighty-one thousand, six hundred seventy-one".