1330716721 has 2 divisors, whose sum is σ = 1330716722. Its totient is φ = 1330716720.

The previous prime is 1330716659. The next prime is 1330716731. The reversal of 1330716721 is 1276170331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784840225 + 545876496 = 28015^2 + 23364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1330716721 - 2¹¹ = 1330714673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1330716731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665358360 + 665358361.

It is an arithmetic number, because the mean of its divisors is an integer number (665358361).

Almost surely, 2^1330716721 is an apocalyptic number.

It is an amenable number.

1330716721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1330716721 is an equidigital number, since it uses as much as digits as its factorization.

1330716721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 1330716721 is about 36478.9901313071. The cubic root of 1330716721 is about 1099.9219561710.

The spelling of 1330716721 in words is "one billion, three hundred thirty million, seven hundred sixteen thousand, seven hundred twenty-one".