3287997721 has 2 divisors, whose sum is σ = 3287997722. Its totient is φ = 3287997720.

The previous prime is 3287997697. The next prime is 3287997737. The reversal of 3287997721 is 1277997823.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3203560000 + 84437721 = 56600^2 + 9189^2 .

It is a cyclic number.

It is not a de Polignac number, because 3287997721 - 2⁷ = 3287997593 is a prime.

It is not a weakly prime, because it can be changed into another prime (3287997781) 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 as a sum of consecutive naturals, namely, 1643998860 + 1643998861.

It is an arithmetic number, because the mean of its divisors is an integer number (1643998861).

Almost surely, 2^3287997721 is an apocalyptic number.

It is an amenable number.

3287997721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3287997721 is an equidigital number, since it uses as much as digits as its factorization.

3287997721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 55.

The square root of 3287997721 is about 57341.0648750091. The cubic root of 3287997721 is about 1486.9984047637.

The spelling of 3287997721 in words is "three billion, two hundred eighty-seven million, nine hundred ninety-seven thousand, seven hundred twenty-one".