1391663017 has 2 divisors, whose sum is σ = 1391663018. Its totient is φ = 1391663016.

The previous prime is 1391663011. The next prime is 1391663033. The reversal of 1391663017 is 7103661931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1376484201 + 15178816 = 37101^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391663017 - 2¹¹ = 1391660969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391663011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695831508 + 695831509.

It is an arithmetic number, because the mean of its divisors is an integer number (695831509).

Almost surely, 2^1391663017 is an apocalyptic number.

It is an amenable number.

1391663017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391663017 is an equidigital number, since it uses as much as digits as its factorization.

1391663017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 1391663017 is about 37304.9998927758. Note that the first 3 decimals coincide. The cubic root of 1391663017 is about 1116.4639265504.

The spelling of 1391663017 in words is "one billion, three hundred ninety-one million, six hundred sixty-three thousand, seventeen".