2751316721 has 4 divisors (see below), whose sum is σ = 2759200500. Its totient is φ = 2743432944.

The previous prime is 2751316709. The next prime is 2751316723. The reversal of 2751316721 is 1276131572.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1727316721 + 1024000000 = 41561^2 + 32000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2751316721 - 2⁶ = 2751316657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2751316723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3941366 + ... + 3942063.

It is an arithmetic number, because the mean of its divisors is an integer number (689800125).

Almost surely, 2^2751316721 is an apocalyptic number.

It is an amenable number.

2751316721 is a deficient number, since it is larger than the sum of its proper divisors (7883779).

2751316721 is an equidigital number, since it uses as much as digits as its factorization.

2751316721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7883778.

The product of its digits is 17640, while the sum is 35.

The square root of 2751316721 is about 52452.9953482163. The cubic root of 2751316721 is about 1401.2432359539.

The spelling of 2751316721 in words is "two billion, seven hundred fifty-one million, three hundred sixteen thousand, seven hundred twenty-one".