1328712961 has 2 divisors, whose sum is σ = 1328712962. Its totient is φ = 1328712960.

The previous prime is 1328712941. The next prime is 1328712991. The reversal of 1328712961 is 1692178231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999508225 + 329204736 = 31615^2 + 18144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328712961 - 2⁹ = 1328712449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1328712941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664356480 + 664356481.

It is an arithmetic number, because the mean of its divisors is an integer number (664356481).

Almost surely, 2^1328712961 is an apocalyptic number.

It is an amenable number.

1328712961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328712961 is an equidigital number, since it uses as much as digits as its factorization.

1328712961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 1328712961 is about 36451.5152085616. The cubic root of 1328712961 is about 1099.3696005011.

The spelling of 1328712961 in words is "one billion, three hundred twenty-eight million, seven hundred twelve thousand, nine hundred sixty-one".