2749848721 has 9 divisors (see below), whose sum is σ = 2820759483. Its totient is φ = 2680681680.

The previous prime is 2749848691. The next prime is 2749848727. The reversal of 2749848721 is 1278489472.

The square root of 2749848721 is 52439.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 132503121 + 2617345600 = 11511^2 + 51160^2 .

It is not a de Polignac number, because 2749848721 - 2²¹ = 2747751569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2749848727) 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 8 ways as a sum of consecutive naturals, for example, 2149360 + ... + 2150638.

Almost surely, 2^2749848721 is an apocalyptic number.

2749848721 is the 52439-th square number.

2749848721 is the 26220-th centered octagonal number.

It is an amenable number.

2749848721 is a deficient number, since it is larger than the sum of its proper divisors (70910762).

2749848721 is an frugal number, since it uses more digits than its factorization.

2749848721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 1320 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 52.

The cubic root of 2749848721 is about 1400.9939745713.

The spelling of 2749848721 in words is "two billion, seven hundred forty-nine million, eight hundred forty-eight thousand, seven hundred twenty-one".