1328431817 has 2 divisors, whose sum is σ = 1328431818. Its totient is φ = 1328431816.

The previous prime is 1328431789. The next prime is 1328431837. The reversal of 1328431817 is 7181348231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295208121 + 33223696 = 35989^2 + 5764^2 .

It is an emirp because it is prime and its reverse (7181348231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1328431817 - 2¹⁰ = 1328430793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1328431837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664215908 + 664215909.

It is an arithmetic number, because the mean of its divisors is an integer number (664215909).

Almost surely, 2^1328431817 is an apocalyptic number.

It is an amenable number.

1328431817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328431817 is an equidigital number, since it uses as much as digits as its factorization.

1328431817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 1328431817 is about 36447.6585942088. The cubic root of 1328431817 is about 1099.2920560456.

The spelling of 1328431817 in words is "one billion, three hundred twenty-eight million, four hundred thirty-one thousand, eight hundred seventeen".