2748281821 has 2 divisors, whose sum is σ = 2748281822. Its totient is φ = 2748281820.

The previous prime is 2748281803. The next prime is 2748281849. The reversal of 2748281821 is 1281828472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2746912921 + 1368900 = 52411^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2748281821 - 2¹¹ = 2748279773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2748281801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1374140910 + 1374140911.

It is an arithmetic number, because the mean of its divisors is an integer number (1374140911).

Almost surely, 2^2748281821 is an apocalyptic number.

It is an amenable number.

2748281821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2748281821 is an equidigital number, since it uses as much as digits as its factorization.

2748281821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114688, while the sum is 43.

The square root of 2748281821 is about 52424.0576548592. The cubic root of 2748281821 is about 1400.7278224094.

The spelling of 2748281821 in words is "two billion, seven hundred forty-eight million, two hundred eighty-one thousand, eight hundred twenty-one".