2828316721 has 2 divisors, whose sum is σ = 2828316722. Its totient is φ = 2828316720.

The previous prime is 2828316719. The next prime is 2828316749. The reversal of 2828316721 is 1276138282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1852441600 + 975875121 = 43040^2 + 31239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2828316721 - 2¹ = 2828316719 is a prime.

Together with 2828316719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2828313721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1414158360 + 1414158361.

It is an arithmetic number, because the mean of its divisors is an integer number (1414158361).

Almost surely, 2^2828316721 is an apocalyptic number.

It is an amenable number.

2828316721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2828316721 is an equidigital number, since it uses as much as digits as its factorization.

2828316721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 2828316721 is about 53181.9209976473. The cubic root of 2828316721 is about 1414.1951615093.

The spelling of 2828316721 in words is "two billion, eight hundred twenty-eight million, three hundred sixteen thousand, seven hundred twenty-one".