2781984549 has 8 divisors (see below), whose sum is σ = 3712316320. Its totient is φ = 1853154576.

The previous prime is 2781984523. The next prime is 2781984563. The reversal of 2781984549 is 9454891872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2781984549 - 2²³ = 2773595941 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 (2781984509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371119 + ... + 378540.

It is an arithmetic number, because the mean of its divisors is an integer number (464039540).

Almost surely, 2^2781984549 is an apocalyptic number.

It is an amenable number.

2781984549 is a deficient number, since it is larger than the sum of its proper divisors (930331771).

2781984549 is a wasteful number, since it uses less digits than its factorization.

2781984549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750899.

The product of its digits is 5806080, while the sum is 57.

The square root of 2781984549 is about 52744.5215069774. The cubic root of 2781984549 is about 1406.4303765623.

The spelling of 2781984549 in words is "two billion, seven hundred eighty-one million, nine hundred eighty-four thousand, five hundred forty-nine".