2748971521 has 2 divisors, whose sum is σ = 2748971522. Its totient is φ = 2748971520.

The previous prime is 2748971507. The next prime is 2748971549. The reversal of 2748971521 is 1251798472.

2748971521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2442336400 + 306635121 = 49420^2 + 17511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2748971521 - 2²³ = 2740582913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2748971501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1374485760 + 1374485761.

It is an arithmetic number, because the mean of its divisors is an integer number (1374485761).

Almost surely, 2^2748971521 is an apocalyptic number.

It is an amenable number.

2748971521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2748971521 is an equidigital number, since it uses as much as digits as its factorization.

2748971521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 46.

The square root of 2748971521 is about 52430.6353289754. The cubic root of 2748971521 is about 1400.8449866643.

The spelling of 2748971521 in words is "two billion, seven hundred forty-eight million, nine hundred seventy-one thousand, five hundred twenty-one".