2781984547 has 4 divisors (see below), whose sum is σ = 2871726016. Its totient is φ = 2692243080.

The previous prime is 2781984523. The next prime is 2781984563. The reversal of 2781984547 is 7454891872.

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

It is a cyclic number.

It is not a de Polignac number, because 2781984547 - 2²⁷ = 2647766819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781981547) 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 3 ways as a sum of consecutive naturals, for example, 44870688 + ... + 44870749.

It is an arithmetic number, because the mean of its divisors is an integer number (717931504).

Almost surely, 2^2781984547 is an apocalyptic number.

2781984547 is a deficient number, since it is larger than the sum of its proper divisors (89741469).

2781984547 is an equidigital number, since it uses as much as digits as its factorization.

2781984547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89741468.

The product of its digits is 4515840, while the sum is 55.

The square root of 2781984547 is about 52744.5214880181. The cubic root of 2781984547 is about 1406.4303762252.

The spelling of 2781984547 in words is "two billion, seven hundred eighty-one million, nine hundred eighty-four thousand, five hundred forty-seven".